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Subject: Re: rook endgame test position

Author: Dann Corbit

Date: 14:57:52 12/15/03

Go up one level in this thread


On December 15, 2003 at 16:23:15, Dieter Buerssner wrote:

>[D] 5k2/1R4p1/5p2/4p2p/1p2P2P/r4P2/PK4P1/8 b - -
>
>This is from a game between Ruffian-Yace in the "CSS-Online-Masters" (time
>control 60 15).
>
>I think, after Ra4, white cannot make progress, and the game will end in draw.
>Yace played Re3? instead (with 0.0 score). Are there engines, that show in
>reasonable time a big score difference between Re3 and Ra4?. I believe Re3 loses
>by force. For example Re3 Rxb4 Re2 Kb3 Rxg2?! (possibly Re3 instead gives more
>resistance) a4.
>
>It is not a real good test position, because engines can show for a long time
>the same score for Ra4 and Re3, and the chosen move might be pure luck.
>Therefore also the question for scores after those moves.

Knightd3 with this configuration file does not find it

E:\PROGRA~3\winboard\KnightD3>type KD3.cfg

/hash exponent 19 uses 12 MB, 20->24MB, 21->48MB, ...
HASH_SIZE_EXPONENT 23

/pawn hash exponent 17->4 MB, 18->8MB, ...
PAWN_HASH_EXPONENT 21

/KD3_book.zbin will only expand to KD3_book.bin, and only if zbin is more
current
BOOK_NAME KD3_book.bin

/Also KD will read the entire book into ram.
/With the 10MB book, that might be a bad idea.
/(The old book was about 1MB)

/claim draws: 0=>only stalemate, 1=>by rules, 2=>also dead draws
CLAIM_DRAWS 1

/By defualt, egms are in workdir\EGM, but you can specify a different
/directory with EGM_DIR
/EGM_DIR C:\Chess\EGM\

/Set to 1 to get extra output from egmProbe
EGM_VERBOSE 0

E:\PROGRA~3\winboard\KnightD3>KnightD3.exe epd \dtest.epd t999
Chess
feature setboard=1 colors=0 analyze=1 sigint=0 usermove=1 done=0
feature myname="KnightDreamer v3.2"
EgmProbe 1.0 Copyright 2003 Johan Melin
DEBUG Newgame
EPD: 5k2/1R4p1/5p2/4p2p/1p2P2P/r4P2/PK4P1/8 b - - bm Ra4; am Re3;
  7  -38   15  69720  a3a4 g2g3 a4a3 b7b4 a3f3 b4b8 f8f7 b8b7
                      f7g6 (464.8k)
  8  -40   39 185927  a3a4 g2g4 h5g4 b7b8 f8e7 f3g4 e7d6 b2b3
                      a4a3 (475.5k)
  8  -29   84 395510  a3d3 ++ (470.3k)
  8  -28  102 490862  a3d3 b7b8 f8f7 b8b4 d3d2 b2a3 d2g2 b4b7
                      f7g6 b7b2 g2g1 (480.8k)
  9  -34  186 908932  a3d3 b7b8 f8f7 b8b4 d3d2 b2a3 d2g2 b4b7
                      f7e6 b7b2 g2g3 b2b6 (487.9k)
  9  -23  249 1216935  a3e3 ++ (487.9k)
  9  -14  288 1400926  a3e3 b7b4 e3e2 b2a3 e2g2 b4b8 f8e7 b8b7
                       e7f8 b7b6 g2h2 b6b8 f8e7 (485.8k)
 10    0  562 2658443  a3e3 b7b4 e3e2 b2a3 e2g2 b4b8 f8e7 b8b7
                       e7e6 b7b6 e6d7 b6b7 d7e6 (472.4k)
 11   11 1747 8502957  a3e3 b7c7 g7g5 h4g5 f6g5 c7c5 e3e2 b2b3
                       e2g2 c5e5 g5g4 f3f4 (486.6k)
 12   16 3821 18395649  a3e3 b7c7 f8g8 c7c8 g8h7 c8c4 g7g5 c4b4
                        e3e2 b2c3 e2g2 h4g5 f6g5 a2a4 (481.4k)
 13    6 9215 44614928  a3e3 b7c7 f8g8 c7c4 g8h7 b2b1 b4b3 a2b3
                        e3b3 b1c1 b3a3 c4c7 a3a1 c1d2 h7g6
                        (484.1k)
 14   11 26858 119139043  a3e3 b7c7 f8g8 c7c8 g8h7 c8c7 h7h6 c7c6
                          e3d3 c6c4 g7g5 b2c2 d3a3 c2b2 (443.6k)
 15    4 85883 393472023  a3e3 b7c7 f8g8 c7c8 g8h7 c8c7 h7h6 c7c6
                          e3e1 c6c1 e1c1 b2c1 g7g5 g2g3 h6g6 c1d2
                          (458.1k)
Total: 0/1

Result by depth:

[   1]      103.0    0.00  1/1 (1/1) (1/1)
[   2]      608.0    0.00  0/1 (0/1) (0/1)
[   3]     1745.0    0.01  1/1 (1/1) (1/1)
[   4]     3084.0    0.01  1/1 (1/1) (1/1)
[   5]     6772.0    0.02  1/1 (1/1) (1/1)
[   6]    19694.0    0.04  1/1 (1/1) (1/1)
[   7]    69720.0    0.15  1/1 (1/1) (1/1)
[   8]   490862.0    1.02  0/1 (0/1) (0/1)
[   9]  1400926.0    2.88  0/1 (0/1) (0/1)
[  10]  2658443.0    5.63  0/1 (0/1) (0/1)
[  11]  8502957.0   17.48  0/1 (0/1) (0/1)
[  12]  18395648.0   38.22  0/1 (0/1) (0/1)
[  13]  44614928.0   92.15  0/1 (0/1) (0/1)
[  14]  119139040.0  268.59  0/1 (0/1) (0/1)
[  15]  393472032.0  858.83  0/1 (0/1) (0/1)

Result by time:

 6.0    19694.0  [  0.04]  1/1 (1/1) (1/1)
 7.0    69720.0  [  0.15]  1/1 (1/1) (1/1)
 8.0   185927.0  [  0.39]  1/1 (1/1) (1/1)
 8.0   395510.0  [  0.84]  0/1 (0/1) (0/1)
 9.0   908932.0  [  1.86]  0/1 (0/1) (0/1)
 9.0  1400926.0  [  2.88]  0/1 (0/1) (0/1)
10.0  2658443.0  [  5.63]  0/1 (0/1) (0/1)
11.0  8502957.0  [ 17.48]  0/1 (0/1) (0/1)
11.0  8502957.0  [ 17.48]  0/1 (0/1) (0/1)
12.0  18395648.0  [ 38.22]  0/1 (0/1) (0/1)
13.0  44614928.0  [ 92.15]  0/1 (0/1) (0/1)
14.0  119139040.0  [268.59]  0/1 (0/1) (0/1)
14.0  119139040.0  [268.59]  0/1 (0/1) (0/1)
15.0  393472032.0  [858.83]  0/1 (0/1) (0/1)

Result by nodes:

 1.0  [     97.0]    0.00  1/1 (1/1) (1/1)
 2.0  [    195.0]    0.00  1/1 (1/1) (1/1)
 3.0  [    995.0]    0.00  0/1 (0/1) (0/1)
 4.0  [   3084.0]    0.01  1/1 (1/1) (1/1)
 5.0  [   6772.0]    0.02  1/1 (1/1) (1/1)
 6.0  [  19694.0]    0.04  1/1 (1/1) (1/1)
 7.0  [  69720.0]    0.15  1/1 (1/1) (1/1)
 8.0  [ 185927.0]    0.39  1/1 (1/1) (1/1)
 9.0  [ 908932.0]    1.86  0/1 (0/1) (0/1)
10.0  [2658443.0]    5.63  0/1 (0/1) (0/1)
11.0  [8502957.0]   17.48  0/1 (0/1) (0/1)
12.0  [18395648.0]   38.22  0/1 (0/1) (0/1)
13.0  [44614928.0]   92.15  0/1 (0/1) (0/1)
14.0  [119139040.0]  268.59  0/1 (0/1) (0/1)
15.0  [393472032.0]  858.83  0/1 (0/1) (0/1)
Totals:
15.00  460400672.0  999.01  0/1 mates: 0



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