Winboard Forum

Posted: **16 Jul 2016, 15:10**

(This issue is is slightly related to "Bug with usebook and edit position?" I guess, but I'll make a new thread to keep it clean and separated. By the way thanks for a quick response on that issue and an interesting insight into the internal workings of Winboard.)

In WinBoard 4.8.0b I manage to get Winboard and Fairy-Max 4.8 to disagree about which side the engine is to play.

The problem is caused by black and white commands (without a go command afterwards), in relation to edit/setboard command and book moves, causing the engine to leave force mode when it should not.

Steps to reproduce:

Winboard startup dialog
Select "Fairy-Max 4.8" -fcp fmax -fd "..\Fairy-Max" /firstXBook
Additional options: -debug
Options/Common engine
Select use book
Unselect first has own book
Unselect second has own book
Play e2e4
Wait for the black book move
Mode/edit position
Select a position that gives a book hint with black in the move: "rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1". Do this by moving blacks piece back on the Board and select black to play. (Copying the FEN to the board will give a sligtly different error situation.)
Mode/machine black

Result: The engine will try to do a white move.

Looking at the debug log WinbBoard GUI sends the "white" and "black", this causes the engine to leave force mode and play white once the GUI sends the black book move to the engine.

Looking at the protocol specification "Idioms and backward compatibility features" part, the white and black command should only be sent with a go command afterwards.

Comparing with the log from "Bug with usebook and edit position?"-thread, there is also missing a "force" command before the book move is sent to the engine.

This is the relevant part of the debug log:

Code: Select all: 13933 >first : . EditPosDone 13934 >first : white 13934 >first : time 30000 13934 >first : otim 30000 13934 >first : black book key = 823c9b50fd114196 book move field = 3299 book hit = d7d5 13935 >first : d7d5

If I paste the FEN onto the board I think the underlying issue is the same, but the behaviour on the board is a bit different: Trying to continue playing white will cause problems for the human player.

This is the full debug log where the edit has been done by hand on the board:

Code: Select all: recognized 'normal' (-1) as variant normal recognized 'normal' (-1) as variant normal shuffleOpenings = 0 Version: WinBoard 4.8.0b + fmax Reset(1, 0) from gameMode 0 recognized 'normal' (-1) as variant normal GameEnds(0, (null), 2) shuffleOpenings = 0 StartChildProcess (dir="..\Fairy-Max") fmax 545 >first : xboard protover 2 564 <first : tellics say Fairy-Max 4.8V 564 <first : tellics say by H.G. Muller 564 <first : tellics say Gothic Chess is protected by U.S. patent #6,481,716 by Ed Trice. 564 <first : tellics say Falcon Chess is protected by U.S. patent #5,690,334 by George W. Duke 565 <first : feature myname="Fairy-Max 4.8V" 565 >first : accepted myname 565 <first : feature memory=1 565 >first : accepted memory 565 <first : feature setboard=0 xedit=1 ping=1 done=0 565 >first : accepted setboard 565 >first : accepted xedit 566 >first : accepted ping 566 >first : accepted done 566 <first : feature variants="normal,nocastle,shatranj,asean,makruk,cambodian,ai-wok,courier,knightmate,capablanca,gothic,falcon,cylinder,berolina,super,seirawan,spartan,great,light-brigade,king-of-the-hill,bifurcator,team-mate,fairy" 566 >first : accepted variants 567 <first : feature option="Resign -check 0" 567 >first : accepted option 567 <first : feature option="Resign Threshold -spin 800 200 1200" 567 >first : accepted option 567 <first : feature option="Claim draw after -spin 50 0 200" 567 >first : accepted option 567 <first : feature option="Ini File -file fmax.ini" 567 >first : accepted option 568 <first : feature option="Multi-PV Margin -spin 0 0 1000" 568 >first : accepted option 568 <first : feature option="Variant fairy selects -combo FIDE-Clobberers /// Clobberers-FIDE /// FIDE-Nutters /// Nutters-FIDE /// Clobberers-Nutters /// Nutters-Clobberers /// FIDE-Rookies /// Rookies-FIDE /// Clobberers-Rookies /// Rookies-Clobberers" 569 >first : accepted option 569 <first : feature option="Makruk rules -combo makruk /// Cambodian /// Ai-wok" 569 >first : accepted option 569 <first : feature option="Dummy Slider Example -slider 20 0 100" 569 >first : accepted option 569 <first : feature option="Dummy String Example -string happy birthday!" 570 >first : accepted option 570 <first : feature option="Dummy Path Example -path ." 570 >first : accepted option 570 <first : feature option="Info -button" 570 >first : accepted option 570 <first : feature option="Clear Hash -button" 570 >first : accepted option 570 <first : feature done=1 570 >first : accepted done 591 >first : memory 68 591 >first : new random 591 >first : level 40 5 0 591 >first : post 591 >first : hard 591 >first : ping 1 Impossible move , type = 0 630 <first : pong 1 nps: w=-1, b=-1 nps: w=-1, b=-1 2067 >first : time 30000 2067 >first : otim 30000 book key = 823c9b50fd114196 book move field = 3234 book hit = c7c5 2068 >first : force 2068 >first : e2e4 2068 >first : c7c5 silence Interrupting first 6024 >first : force 13929 >first : memory 68 13929 >first : new random 13929 >first : level 40 5 0 13929 >first : post 13929 >first : hard 13929 >first : ping 2 Impossible move c7c5, type = 0 13931 >first : force 13931 >first : a2a3 13931 >first : edit 13931 >first : # 13931 >first : Pe4 13931 >first : Pa2 13931 >first : Pb2 13931 >first : Pc2 13931 >first : Pd2 13931 >first : Pf2 13931 >first : Pg2 13931 >first : Ph2 13931 >first : Ra1 13931 >first : Nb1 13931 >first : Bc1 13932 >first : Qd1 13932 >first : Ke1 13932 >first : Bf1 13932 >first : Ng1 13932 >first : Rh1 13932 >first : c 13932 >first : Ra8 13932 >first : Nb8 13932 >first : Bc8 13932 >first : Qd8 13932 >first : Ke8 13932 >first : Bf8 13932 >first : Ng8 13932 >first : Rh8 13932 >first : Pa7 13932 >first : Pb7 13932 >first : Pc7 13933 >first : Pd7 13933 >first : Pe7 13933 >first : Pf7 13933 >first : Pg7 13933 >first : Ph7 13933 >first : . EditPosDone 13934 >first : white 13934 >first : time 30000 13934 >first : otim 30000 13934 >first : black book key = 823c9b50fd114196 book move field = 3299 book hit = d7d5 13935 >first : d7d5 nps: w=-1, b=-1 Undoing extra move from first, gameMode 2 Interrupting first 13935 >first : undo 13953 <first : pong 2 13954 <first : # times @ 9585497 13954 <first : # 16+16 pieces, centr = (1,1) R=40 13954 <first : 1 -10 0 3 e4d5 13956 <first : 1 -9 0 3 e4e5 13956 <first : 1 -6 0 3 d2d3 13957 <first : 1 13 0 3 f2f3 13957 <first : 1 15 0 3 b1c3 13958 <first : 1 18 0 13 f1d3 13958 <first : 2 -15 0 61 f1d3 b8c6 13959 <first : 2 -8 0 403 f1b5 c7c6 b5d3 13959 <first : 2 -6 0 469 d2d3 d5e4 13960 <first : 2 6 0 501 f2f3 b8c6 13960 <first : 2 7 1 644 b1c3 g8f6 13961 <first : 3 8 1 1231 b1c3 g8f6 f2f3 13962 <first : 3 12 1 1635 d1f3 c8e6 d2d4 13963 <first : 4 -13 1 5631 d1f3 g8f6 b1c3 c8e6 13968 <first : 4 -5 1 10794 f1d3 b8c6 b1c3 g8f6 13974 <first : 4 12 3 15450 f2f3 g8f6 b1c3 b8c6 13982 <first : 5 3 3 21005 f2f3 g8f6 b1c3 b8c6 f1d3 14003 <first : 5 17 6 43039 b1c3 g8f6 f1d3 b8c6 f2f4 14031 <first : 6 5 7 70693 b1c3 g8f6 f1b5 c7c6 b5d3 c6c5 f2f4 14183 <first : 7 20 23 225479 b1c3 g8f6 f1d3 c7c5 f2f4 b8c6 g1f3 14510 <first : 8 -7 56 562705 b1c3 g8f6 e4e5 f6g4 d2d4 b8c6 f2f3 g4h6 16734 <first : 9 14 279 2833500 b1c3 g8f6 e4e5 f6d7 d2d4 c7c6 c1f4 d8b6 a1b1 17838 <first : # times @ 9589381: real=3884 cpu=3884 17838 <first : # promo = 0 (`) GT = 0 17838 <first : move b1c3 17846 <first : # times @ 9589397 17846 <first : # 16+16 pieces, centr = (1,1) R=40 17846 <first : 1 -15 0 9 e4d5 d8d5 17847 <first : 1 -3 0 11 e4e5 17848 <first : 1 17 0 65 f2f3 17848 <first : 2 -8 0 95 f2f3 b8c6 17849 <first : 2 9 0 243 b1c3 g8f6 17849 <first : 3 27 0 1082 b1c3 g8f6 f2f3 17854 <first : 4 1 0 7363 b1c3 d5e4 c3e4 b8c6 17860 <first : 4 7 1 12936 f1b5 b8c6 f2f3 g8f6 b5d3 17881 <first : 5 -9 3 35194 f1b5 c7c6 b5d3 c8e6 f2f4 b8d7 17911 <first : 5 6 6 64408 f1d3 d5e4 d3e4 g8f6 e4d3 17937 <first : 5 24 9 90896 f2f3 b8c6 b1c3 g8f6 f1d3 17982 <first : 6 7 14 136729 f2f3 g8f6 b1c3 b8c6 18200 <first : 7 -4 35 356359 f2f3 c7c6 b1c3 c8e6 f1d3 b8d7 g1e2 18471 <first : 7 10 62 622624 b1c3 g8f6 d2d3 b8c6 c1g5 c8e6 g1f3 18820 <first : 8 -12 96 974533 b1c3 g8f6 e4e5 f6g4 d2d4 b8c6 f2f3 g4h6 19420 <first : 8 -7 157 1575666 d1e2 d5e4 e2e4 c7c6 d2d4 g8f6 e4f4 b8d7 19626 <first : 8 -3 177 1790830 f1b5 c7c6 b5d3 b8a6 e4d5 d8d5 f2f3 a6c5 d3e2 20392 <first : 8 0 254 2571649 e4d5 d8d5 b1c3 d5d8 d2d4 b8c6 c1e3 c8f5 21907 <first : 9 -6 405 4132616 e4d5 d8d5 b1c3 d5e6 g1e2 c7c6 d2d4 b8d7 c1f4 g8f6 22885 <first : 9 -3 503 5101509 e4d5 d8d5 b1c3 d5e6 d1e2 c7c5 f2f4 b8d7 g1f3 g8f6 24583 <first : 9 1 673 6833756 f2f3 g8f6 b1c3 c7c5 g1e2 b8c6 e2f4 d5e4 c3e4 25783 <first : 9 16 794 8017397 b1c3 g8f6 e4e5 f6d7 d2d4 c7c6 c1f4 d8b6 a1b1 25955 <first : # times @ 9597509: real=8112 cpu=8109 25955 <first : # promo = 0 (`) GT = 0 25955 <first : move b1c3 write FEN 50-move: 0 1 1 e1. p=-6 CopyTextToClipboard(): lock count 1 CopyTextToClipboard(): lock count 0 CopyTextToClipboard(): err 0 locked 0 GameEnds(29, xboard exit, 2) 107313 >first : result * {xboard exit} 107313 >first : force 107313 >first : ping 3 107313 >first : quit name = '%APPDATA%\winboard48.ini', expanded name = 'C:\Users\AW\AppData\Roaming\winboard48.ini'

This is the full debug log where the edit has been done by pasting the FEN position on to the board:

Code: Select all: recognized 'normal' (-1) as variant normal recognized 'normal' (-1) as variant normal shuffleOpenings = 0 Version: WinBoard 4.8.0b + fmax Reset(1, 0) from gameMode 0 recognized 'normal' (-1) as variant normal GameEnds(0, (null), 2) shuffleOpenings = 0 StartChildProcess (dir="..\Fairy-Max") fmax 546 >first : xboard protover 2 564 <first : tellics say Fairy-Max 4.8V 564 <first : tellics say by H.G. Muller 564 <first : tellics say Gothic Chess is protected by U.S. patent #6,481,716 by Ed Trice. 565 <first : tellics say Falcon Chess is protected by U.S. patent #5,690,334 by George W. Duke 565 <first : feature myname="Fairy-Max 4.8V" 565 >first : accepted myname 566 <first : feature memory=1 566 >first : accepted memory 566 <first : feature setboard=0 xedit=1 ping=1 done=0 566 >first : accepted setboard 566 >first : accepted xedit 566 >first : accepted ping 566 >first : accepted done 566 <first : feature variants="normal,nocastle,shatranj,asean,makruk,cambodian,ai-wok,courier,knightmate,capablanca,gothic,falcon,cylinder,berolina,super,seirawan,spartan,great,light-brigade,king-of-the-hill,bifurcator,team-mate,fairy" 567 >first : accepted variants 567 <first : feature option="Resign -check 0" 567 >first : accepted option 567 <first : feature option="Resign Threshold -spin 800 200 1200" 567 >first : accepted option 568 <first : feature option="Claim draw after -spin 50 0 200" 568 >first : accepted option 568 <first : feature option="Ini File -file fmax.ini" 568 >first : accepted option 568 <first : feature option="Multi-PV Margin -spin 0 0 1000" 568 >first : accepted option 568 <first : feature option="Variant fairy selects -combo FIDE-Clobberers /// Clobberers-FIDE /// FIDE-Nutters /// Nutters-FIDE /// Clobberers-Nutters /// Nutters-Clobberers /// FIDE-Rookies /// Rookies-FIDE /// Clobberers-Rookies /// Rookies-Clobberers" 569 >first : accepted option 569 <first : feature option="Makruk rules -combo makruk /// Cambodian /// Ai-wok" 569 >first : accepted option 570 <first : feature option="Dummy Slider Example -slider 20 0 100" 570 >first : accepted option 570 <first : feature option="Dummy String Example -string happy birthday!" 570 >first : accepted option 570 <first : feature option="Dummy Path Example -path ." 570 >first : accepted option 570 <first : feature option="Info -button" 571 >first : accepted option 571 <first : feature option="Clear Hash -button" 571 >first : accepted option 571 <first : feature done=1 571 >first : accepted done 582 >first : memory 68 582 >first : new random 582 >first : level 40 5 0 582 >first : post 582 >first : hard 582 >first : ping 1 Impossible move , type = 0 616 <first : pong 1 nps: w=-1, b=-1 nps: w=-1, b=-1 3166 >first : time 30000 3166 >first : otim 30000 book key = 823c9b50fd114196 book move field = 3234 book hit = c7c5 3166 >first : force 3167 >first : e2e4 3167 >first : c7c5 silence Interrupting first 7082 >first : force PasteTextFromClipboard(): lock count 0 PasteTextFromClipboard(): lock count 0 PasteTextFromClipboard(): err 0 locked 0 FEN castling rights: 7 0 4 7 0 4 PasteFenFromString(): fen 'rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1' shuffleOpenings = 0 FEN castling rights: 7 0 4 7 0 4 18971 >first : memory 68 18972 >first : new random 18972 >first : level 40 5 0 18972 >first : post 18972 >first : hard 18972 >first : ping 2 Impossible move c7c5, type = 0 18973 >first : force 18973 >first : a2a3 18973 >first : edit 18973 >first : # 18973 >first : Pa2 18973 >first : Pb2 18973 >first : Pc2 18974 >first : Pd2 18974 >first : Pe2 18974 >first : Pf2 18974 >first : Pg2 18974 >first : Ph2 18974 >first : Ra1 18974 >first : Nb1 18974 >first : Bc1 18974 >first : Qd1 18974 >first : Ke1 18974 >first : Bf1 18974 >first : Ng1 18974 >first : Rh1 18974 >first : c 18974 >first : Ra8 18974 >first : Nb8 18974 >first : Bc8 18975 >first : Qd8 18975 >first : Ke8 18975 >first : Bf8 18975 >first : Ng8 18975 >first : Rh8 18975 >first : Pa7 18975 >first : Pb7 18975 >first : Pc7 18975 >first : Pd7 18975 >first : Pe7 18975 >first : Pf7 18975 >first : Pg7 18975 >first : Ph7 18975 >first : . EditPosDone 18976 >first : memory 68 18976 >first : new random 18977 >first : level 40 5 0 18977 >first : post 18977 >first : hard 18977 >first : ping 3 Impossible move c7c5, type = 0 18978 >first : force 18978 >first : a2a3 18978 >first : edit 18978 >first : # 18978 >first : Pe4 18978 >first : Pa2 18978 >first : Pb2 18978 >first : Pc2 18978 >first : Pd2 18978 >first : Pf2 18978 >first : Pg2 18979 >first : Ph2 18979 >first : Ra1 18979 >first : Nb1 18979 >first : Bc1 18979 >first : Qd1 18979 >first : Ke1 18979 >first : Bf1 18979 >first : Ng1 18979 >first : Rh1 18979 >first : c 18979 >first : Ra8 18979 >first : Nb8 18979 >first : Bc8 18979 >first : Qd8 18979 >first : Ke8 18979 >first : Bf8 18980 >first : Ng8 18980 >first : Rh8 18980 >first : Pa7 18980 >first : Pb7 18980 >first : Pc7 18980 >first : Pd7 18980 >first : Pe7 18980 >first : Pf7 18980 >first : Pg7 18980 >first : Ph7 18980 >first : . EditPosDone 18995 <first : pong 2 19010 <first : pong 3 22558 >first : white 22558 >first : time 30000 22558 >first : otim 30000 22558 >first : black book key = 823c9b50fd114196 book move field = 3364 book hit = e7e5 22558 >first : e7e5 nps: w=-1, b=-1 silence 22651 <first : # times @ 13311705 22651 <first : # 16+16 pieces, centr = (1,1) R=40 22651 <first : 1 15 0 3 d2d4 22652 <first : 1 26 0 5 g1f3 22653 <first : 2 -6 0 67 g1f3 b8c6 22653 <first : 2 13 0 173 d2d3 d7d5 22654 <first : 3 7 0 971 d2d3 f8b4 b1c3 b8c6 22654 <first : 3 9 1 2153 d2d4 e5d4 d1d4 22654 <first : 3 24 1 2449 b1c3 b8c6 d2d3 22655 <first : 3 25 1 2753 g1f3 b8c6 d2d4 22655 <first : 4 -13 1 3508 g1f3 b8c6 d2d4 g8f6 22655 <first : 4 -2 1 5167 g1h3 d7d5 b1c3 g8f6 22656 <first : 4 13 3 9642 d2d4 b8c6 g1f3 e5d4 22656 <first : 5 9 4 25890 d2d4 e5d4 d1d4 b8c6 d4d3 22657 <first : 5 10 6 41111 d2d3 f8b4 b1c3 b8c6 d1g4 d8f6 22657 <first : 5 12 7 55422 f2f3 b8c6 f1d3 d8h4 g2g3 h4h5 22671 <first : 5 24 12 90535 f1d3 d7d5 b1c3 g8f6 g1f3 22710 <first : 6 2 15 128250 f1d3 d7d5 c2c4 d5c4 d3c4 b8c6 22752 <first : 6 4 20 168833 f1e2 b8c6 d2d3 g8f6 b1c3 d7d5 22819 <first : 6 12 26 235528 g1e2 d7d6 d2d4 b8c6 b1c3 c8e6 22962 <first : 7 -4 40 375839 g1e2 d7d6 d2d3 b8c6 b1c3 c8e6 c1e3 23299 <first : 7 24 74 707117 g1f3 d7d6 f1e2 f7f5 b1c3 g8f6 d2d3 23775 <first : 8 12 121 1177726 g1f3 g8f6 b1c3 f8d6 d2d4 e5d4 f3d4 e8g8 26890 <first : 9 23 433 4239357 g1f3 b8c6 b1c3 f8c5 f1d3 g8f6 c3a4 c5d6 e1g1 27510 <first : # times @ 13316666: real=4961 cpu=4950 27510 <first : # promo = 0 (`) GT = 0 27510 <first : move g1f3 Ignoring move out of turn by first, gameMode 2, forwardMost 2 Interrupting first 29134 >first : time 30000 29134 >first : otim 29342 book key = a6e050cf2a640274 book hit = (NULL) 29135 >first : d2d3 29135 >first : go 29244 <first : Illegal move:d2d3 29254 <first : # times @ 13318288 29254 <first : # 16+16 pieces, centr = (1,1) R=40 29254 <first : 1 -75 0 3 a7a5 29255 <first : 1 -66 0 3 a7a6 29256 <first : 1 -1 0 3 d7d5 29256 <first : 1 5 0 3 d7d6 29257 <first : 1 6 0 3 f7f6 29257 <first : 1 23 0 3 f8d6 29257 <first : 2 3 0 21 f8d6 d2d4 29258 <first : 3 8 0 337 f8d6 b1c3 h7h5 29258 <first : 4 -20 0 430 f8d6 b1c3 h7h5 d2d4 29259 <first : 4 -16 0 1693 g8f6 f1d3 d7d6 e1g1 29259 <first : 4 -15 0 2278 d7d6 f1d3 29259 <first : 5 -15 0 2850 d7d6 f1d3 29260 <first : 6 -19 3 11717 d7d6 f1e2 a7a5 d2d4 e5d4 f3d4 29260 <first : 7 -15 4 28183 d7d6 f1d3 29500 <first : 8 -19 35 328660 d7d6 f1e2 a7a5 d2d4 b8c6 b1c3 c8e6 e1g1 33692 >first : time 29989 33692 >first : otim 28897 book key = a6e050cf2a640274 book hit = (NULL) 33692 >first : d2d3 34228 <first : 9 7 508 4871184 d7d6 d2d3 g8f6 f1e2 38125 <first : 9 8 898 8672368 f8d6 b1a3 f7f6 a3c4 d6e7 d2d4 d7d6 c1e3 b8c6 38486 <first : # times @ 13327633: real=9345 cpu=9352 38486 <first : # promo = 0 (`) GT = 0 38486 <first : move f8d6 silence 38593 <first : # times @ 13327633 38593 <first : # 16+16 pieces, centr = (1,1) R=40 38593 <first : 1 6 0 3 a7a5 38594 <first : 1 11 0 9 c7c6 38594 <first : 1 15 0 15 d8f6 38595 <first : 2 -13 0 49 d8f6 b1c3 38595 <first : 2 -6 0 73 g8e7 38595 <first : 2 2 0 173 a7a6 b1d2 38596 <first : 2 4 0 197 f7f6 b1d2 38596 <first : 3 4 0 282 f7f6 f1e2 a7a5 38597 <first : 3 14 0 480 h7h5 b1c3 g8f6 38597 <first : 3 18 0 930 g8f6 b1c3 e8g8 38597 <first : 3 19 0 1254 a7a5 b1c3 b8c6 38598 <first : 4 -1 0 1754 a7a5 b1c3 b8c6 c1e3 38598 <first : 4 2 0 2010 f7f6 f1e2 g8e7 e1g1 38598 <first : 4 4 1 3175 b8c6 b1c3 f7f6 c1e3 38599 <first : 4 10 1 5468 g8e7 b1c3 e8g8 c1e3 38599 <first : 4 12 1 6005 g8f6 f1e2 e8g8 e1g1 38600 <first : 5 4 1 14989 g8f6 f1e2 e8g8 e1g1 b8c6 38600 <first : 5 5 1 16155 g8f6 38601 <first : 5 22 4 37078 g8h6 b1d2 e8g8 d2c4 d6b4 38601 <first : 6 -11 9 86213 g8h6 f1e2 e8g8 e1g1 f7f5 b1c3 38609 <first : 6 -8 12 115843 g8e7 b1d2 f7f6 d2c4 d6b4 c2c3 b4c5 38616 <first : 6 2 14 122485 g8f6 f1e2 e8g8 e1g1 b8c6 b1c3 38698 <first : 6 16 21 201941 f7f6 b1c3 g8e7 f1e2 e8g8 e1g1 38904 <first : 7 0 42 406430 f7f6 b1d2 g8e7 d2c4 e8g8 c4d6 39038 <first : 7 4 56 537999 h7h5 b1d2 f7f6 d2c4 d6e7 c1e3 b8c6 39151 <first : 7 7 67 649538 b8c6 b1d2 g8f6 d2c4 e8g8 c1d2 b7b5 c4d6 c7d6 39832 <first : 8 0 135 1313551 b8c6 b1d2 f7f6 d2c4 d6e7 c1e3 b7b5 c4d2 40473 <first : 8 3 199 1944689 a7a6 b1d2 f7f6 d2c4 d6e7 c1e3 b7b5 c4d2 41437 <first : 9 1 294 2884280 a7a6 b1d2 f7f6 f1e2 g8h6 d2c4 d6e7 e1g1 e8g8 Interrupting first 41620 >first : time 29509 41620 >first : otim 28584 book key = 6c09db7c55b43c21 book hit = (NULL) 41640 >first : f2f3 43370 <first : # times @ 13332516: real=4883 cpu=4883 43370 <first : # promo = 0 (`) GT = 0 43370 <first : move a7a6 silence 43473 <first : Illegal move:f2f3 GameEnds(29, xboard exit, 2) write FEN 50-move: 0 5 1 e1. p=-6 e2. p=-3 e3. p=-3 e4. p=-6 e5. p=-3 62971 >first : result * {xboard exit} 62971 >first : force 62971 >first : ping 4 62971 >first : quit name = '%APPDATA%\winboard48.ini', expanded name = 'C:\Users\AW\AppData\Roaming\winboard48.ini'

Posted: **16 Jul 2016, 22:02**

Indeed, I also ran into this problem when preparing my Xiangqi engine for the Olympiad, when I tried to analyze positions with black to move. I guess Fairy-Max and HaQiKi D belong to the very few engines that still use the 'edit' command. It has todowith sending the 'force' and the 'black' command in the wrong order. When I added sending the 'black' command to set black to move, I had assumed 'edit' would always switch the engine to force mode. But in fact it should not alter what the engine plays.

Posted: **17 Jul 2016, 12:27**

Actually Winboard do send the force command before the edit command, as the debug log shows.

The problem is that Fairy-Max interpret the white and black command as "...and leave force mode", and thus starts to play after getting the book move from the GUI. The protocol specification only says "Set White on move. Set the engine to play Black. Stop clocks.". It does not specifically say to leave force mode or not. So if the white and black command is not suppose to be interpreted as leave force mode, then this is actually a bug in Fairy-Max and not in Winboard.

On the other hand the "13. Idioms and backward compatibility features" chapter of the specification says that Winboard/Xbord only will use the black and white command with a go command afterwards. If that is always done, then it is not important if the black and white command should leave force mode or not. Maybe this limitation was specified because the white and black command was implemented differently by engines? In this case Winboard sends the black and white command without a go afterwards, so it is not following the specification in chapter 13.

The "missing" force command I mentioned was the following force command I saw in the debug log between Fruit and Winboard just before sending the book move to the engine (in the "Bug with usebook and edit position?" thread):

Code: Select all: 100923 >first : time 30000 100923 >first : otim 30000 book key = 0844931a6ef4b9a0 book move field = 405 book hit = g1f3 100923 >first : force 100924 >first : usermove g1f3

Compared to the debug log with Fairy-Max, where the book move does not have a force in front of it:

Code: Select all: 13934 >first : white 13934 >first : time 30000 13934 >first : otim 30000 13934 >first : black book key = 823c9b50fd114196 book move field = 3299 book hit = d7d5 # No force command here 13935 >first : d7d5

Adding this force command would be one way of preventing Fairy-Max to play after getting the black command followed by a book move. In that case maybe the specification in chapter 13 also should be updated with a white/time/otime/black/force idom.

Winboard Forum

Bug with black/white command together with usebook and edit

Bug with black/white command together with usebook and edit

Re: Bug with black/white command together with usebook and e

Re: Bug with black/white command together with usebook and e