Thanks Ed for sharing.
But I have one question, you do this only at pv nodes (beta != alpha + 1) like it's done on IID, or you do it at every node?
best regards,
Alvaro
Moderators: hgm, Rebel, chrisw
Thanks Ed for sharing.
Every node.
This correct. With this trick, my engine searches most test positions 3-4 more plies deep. So it looks like, but it isn't. But those alleged search depths are never really true or who believes that the big engines really can search any complex position entirely to depth 36 or deeper? They do this only for particular lines, still "36" looks amazing.
Yes. Every node. Only when I do it at every nodes the engine plays notably stronger (against its former self).
Code: Select all
// Step 11. If the position is not in TT, decrease depth by 2
if ( PvNode
&& depth >= 6
&& !ttMove)
depth -= 2;
Code: Select all
# PLAYER : RATING ERROR POINTS PLAYED (%) W D L D(%) CFS(%)
1 OliThink 5.6.5b : 35 10 1377.5 2505 55.0 903 949 653 37.9 100
2 OliThink 5.6.5 : 0 ---- 1127.5 2505 45.0 653 949 903 37.9 ---
White advantage = 11.58 +/- 5.75
Draw rate (equal opponents) = 38.23 % +/- 1.00
Code: Select all
./olithink565b
2rq1bk1/1br2p1p/p2p2p1/1p1P4/4Q3/PP3N2/1BP5/1K1R3R w - - bm Rxh7
1 -128 0 123 c2c3
2 -131 0 597 c2c4 b5c4
3 -152 0 1901 c2c4 b5c4 b3b4
4 -161 0 10651 e4d4 f7f6 c2c4 b5c4
5 -151 0 14165 e4d4 f7f6 d4f4 f8g7 c2c3
6 -148 1 23682 e4d4 f7f6 f3g5 c7c2 g5e6 d8e7
7 -148 1 32303 e4d4 f7f6 f3g5 c7c2 g5e6 d8e7 d4f6
8 -95 1 45631 e4d4 f7f6 f3g5 c7c2 h1h7 f8e7 d4e4 f6g5
9 -96 5 134530 e4d4 f7f6 f3g5 c7e7 g5e6 e7e6 d5e6 b7h1 d1h1
10 -88 9 256468 e4d4 f7f6 f3g5 c7e7 c2c4 b5c4 b3c4 f8g7 g5e6 e7e6
11 -84 14 391625 e4d4 f7f6 f3g5 c7e7 g5e6 e7e6 d5e6 b7h1 d1h1 f8e7 c2c3
12 -50 21 641480 e4d4 f7f6 f3g5 c7e7 g5e4 e7e5 d4a7 e5e4 a7b7 c8c7 b7a6
13 -52 34 1109766 e4d4 f7f6 f3g5 c7e7 h1h2 f8g7 g5e6 d8d7 e6g7 e7e5 d4h4 d7g7 b2e5
14 -52 63 2197935 e4d4 f7f6 f3g5 c7e7 h1h2 f8g7 g5e6 d8d7 e6g7 e7e5 d4h4 d7g7 b2e5 d6e5
15 -46 112 4190512 e4d4 f7f6 f3g5 c7e7 h1h2 e7d7 d4e4 d8e8 e4e8 c8e8 b2f6 h7h6 g5e6 d7f7 h2f2
16 -52 192 7447260 e4d4 f7f6 f3g5 c7e7 h1h2 e7d7 d4e4 d8e8 b2f6 e8e4 g5e4 h7h6 f6g5 f8g7 g5h6 g7e5
17 -14 356 14686218 e4d4 f7f6 f3g5 c7e7 h1h2 e7d7 g5e6 d8e7 d1f1 f8g7 e6g7 g8g7 f1f6 e7e1 b1a2 g7g8 f6f4
18 2 645 27681086 e4d4 f7f6 f3g5 c7e7 h1h2 f8g7 g5h7 e7f7 d4g4 g6g5 d1f1 f6f5 g4g5 d8g5 h7g5 f7f8 g5e6
19 2 1229 54845898 e4d4 f7f6 f3g5 c7e7 h1h2 e7g7 g5e6 d8e7 e6g7 f8g7 c2c4 b5c4 b3c4 h7h5 d1g1 g8h7 h2g2 g6g5
20 7 2001 90917164 e4d4 f7f6 f3g5 c7e7 h1h2 e7g7 g5e6 d8e7 e6g7 f8g7 d4h4 h7h5 h2f2 g8f7 c2c4 b5c4
21 22 2979 138245964 e4d4 f7f6 f3g5 c7e7 d4f6 f8g7 f6e7 d8e7 h1h7 g7f6 h7e7 f6e7 g5e4 g6g5 b2c3 g5g4 d1g1 b7d5
Code: Select all
../565/olithink
2rq1bk1/1br2p1p/p2p2p1/1p1P4/4Q3/PP3N2/1BP5/1K1R3R w - - bm Rxh7
1 -128 0 123 c2c3
2 -131 0 597 c2c4 b5c4
3 -152 0 1901 c2c4 b5c4 b3b4
4 -161 0 10651 e4d4 f7f6 c2c4 b5c4
5 -151 0 14166 e4d4 f7f6 d4f4 f8g7 c2c3
6 -148 1 23267 e4d4 f7f6 f3g5 c7c2 g5e6 d8e7
7 -148 1 35045 e4d4 f7f6 f3g5 c7c2 g5e6 d8e7 d4f6
8 -95 2 51192 e4d4 f7f6 f3g5 c7c2 h1h7 f8e7 d4e4 f6g5
9 -96 5 143034 e4d4 f7f6 f3g5 c7e7 g5e6 e7e6 d5e6 b7h1 d1h1
10 -88 9 247671 e4d4 f7f6 f3g5 c7e7 c2c4 b5c4 b3c4 f8g7 g5e6 e7e6
11 -84 17 514296 e4d4 f7f6 f3g5 c7e7 g5e6 e7e6 d5e6 b7h1 d1h1 f8e7 c2c3
12 -61 56 1988505 e4d4 f7f6 f3g5 c7d7 d4e4 d8e8 e4e8 c8e8 b2f6 h7h6 g5e6 a6a5
13 -52 95 3631738 e4d4 f7f6 f3g5 c7e7 h1h2 f8g7 g5e6 d8d7 e6g7 e7e5 d4h4 d7g7 b2e5
14 -46 209 8635629 e4d4 f7f6 f3g5 c7e7 h1h2 e7d7 d4e4 d8e8 e4e6 e8e6 d5e6 d7c7 b2f6 h7h6 g5f7
15 26 367 16017463 h1h7 g8h7 d1h1 f8h6 e4f4 d8f8 f4f6 c7c3 b2c3 c8c3 f6c3 b7d5 c3f6 d5f3 f6f3 h7g8
16 25 524 23978895 h1h7 g8h7 d1h1 f8h6 e4f4 d8f8 f4f6 c7c3 b2c3 c8c3 f6c3 b7d5 c3d3 d5c6 d3e3 f7f6 c2c3
17 296 1626 80801479 h1h7 g8h7 d1h1 f8h6 e4f4 d8f8 f3g5 h7g8 g5e4 f7f5 h1h6 f8h6 e4f6 g8g7 f6g4 g7g8 g4h6 g8h7 h6f7 h7g8 f7d6 c8b8
18 321 3523 181808274 h1h7 g8h7 d1h1 f8h6 e4f4 d8f8 f3g5 h7g8 g5e4 f7f5 h1h6 f8h6 e4f6 g8g7 f6g4 g7f7 g4h6 f7e7 f4e3 e7f8 e3e6 f5f4 e6d6 f8e8 d6g6 e8d8
As long as one doesn't lie against elo
Sure, but that's another subject, I think we have a misunderstandinghgm wrote: ↑Sun Aug 23, 2020 7:37 pm Not really. Printing depth has never contributed anything to Elo. It is purely a service to the engine user. Intentionally lying about it seems rather immoral. People did not look kindly upon Vas, for cheating with the depth. Or upon Robert, for adding 14% to his nps. Both had high Elo, as well as a ruined reputation.