Repetition draw claiming bug by Soldat

[Lyapko George]

Geschrieben von: / Posted by: Lyapko George at 14 January 2003 12:45:49:

In my currently running round of blitz tournament(134), there were 4 identical games between Soldat(white) and TGiant(black).
In all of them Soldat claimed a draw by repetition after it's move 12. Qc3, where in fact three repetition will appear only after TGiant's move 12...Ne4, so Soldat had no right to claim a draw.
Anywhere, I let the result stay(TGiant also claimed a draw after its move), but in fact this is a bug.
Strange thing that with opposite colours there were 4 different games...
Here is analysis of LGPGNVER:
Game 1: Soldat_025b-TGiant_107
1. e4 d5 2. exd5 Nf6 3. c4 e6 4. dxe6 Bxe6 5. Qb3 b6 6. Ne2 Nc6 7. Nf4 Nd4
8. Qc3 Ne4 9. Qd3 Nc5 10. Qc3 Ne4 11. Qd3 Nc5 12. Qc3
Result :1/2-1/2 {Draw by repetition}
Warning level :2
Final position: r2qkb1r/p1p2ppp/1p2b3/8/2PnnN2/2Q5/PP1P1PP1/RNB1KB1R b KQkq - 14 12
Analyze result:1/2-1/2 {three repetition after next move 12... Ne4}
And here is part of winboard.debug:


100410 >first : e4c5
100410 <first : ply  score    time     nodes  pv
100410 <first :   1     40       0       143 d3c3 
100410 <first :   2     58       0       732 d3c3 e6c8 
100460 <first :   3     76       0      2147 d3c3 h8g8 f4e6 
100520 <first :   4     75       0     13651 d3c3 e6f5 c3e3 c5e4 
100740 <first :   5     75      11     40899 d3c3 e6f5 c3e3 c5e4 d2d3 
101510 <first :   6     36      33    108671 d3c3 c5e4 c3d3 e6f5 f2f3 d8h4 
106060 <first :   7     76     110    318672 d3c3 c5e4 c3d3 e4c5 d3c3 h8g8 f4e6 
106060 <first :   8     56     565   1988291 d3c3 e6f5 d2d3 c5a4 c3d2 f8b4 b1c3 d8e7 
106060 <first : 
106060 <first : Null riuscite : 128839, fallite : 47458
106060 <first : move d3c3 
Interrupting second
106060 >second: time 25134
otim 25381
106060 >second: d3c3
106060 <first : 1/2-1/2 {Draw by repetition}
GameEnds(33, Draw by repetition, 1)
Interrupting first
106060 >first : result 1/2-1/2 {Draw by repetition}
Interrupting second
106060 >second: result 1/2-1/2 {Draw by repetition}
106060 >first : force
106060 >second: force
106060 <second:   1    10         0        126 c5e4 
106060 <second:   2    10         0        516 c5e4 
106060 <second:   3    10         0        517 c5e4 
106060 <second:   3    10         0       3339 c5e4 
106060 <second:   4    10         0       3340 c5e4 
106280 <second:   4    10         0      28234 c5e4 
106280 <second:   5    10         0      28235 c5e4 
107380 <second:   5    10         0     182833 c5e4 
107380 <second:   6    10         0     182834 c5e4 
113640 <second: move c5e4 
Undoing extra move from second, gameMode 8
113640 >second: undo
113640 <second: 1/2-1/2 {3-rep rule(TG)}
113640 <second: Unknown command: result 1/2-1/2 {Draw by repetition}
113640 <second: Unknown command: force
113640 <second: Unknown command: undo
Reset(0, 1) from gameMode 8


Best regards,
George