Author: Dan Homan
Date: 08:54:34 06/14/04
Go up one level in this thread
In this position, pruning with the swap function makes a big difference for EXchess. With it, I get the following in a short (5 sec) search... 12. -2.48 2 1695687 1. ... hxg5 2. Bb3 Be6 3. Rac1 b5 4. Rxc8 Rxc8 5. R d1 Rc6 6. Kh1 Kh8 7. Be1 Ne3 12. -2.48 2 2072268 1. ... hxg5 2. Bb3 Be6 3. Rac1 b5 4. Rxc8 Rxc8 5. R d1 Rc6 6. Kh1 Kh8 7. Be1 Ne3 node_count = 4365312 quiescent nodes = 299510 eval_count = 3942338 hash hits = 211746 hash moves = 60000 pawn hash hits = 3882870 node_rate = 873062 null cuts = 389510 exten = 133815 int_iter = 11437 egtb_probes = 0 egtb_hits = 0 fail_high(%) = 92 So the quiescent nodes are only 6.8% of the tree. If I shut off the swap function pruning, I get the following in a 5 sec. search... 12. -2.48 4 3352392 1. ... hxg5 2. Bb3 Be6 3. Rac1 Rc6 4. Ba4 Rcc8 5. R xc8 Rxc8 6. Kh1 Rc7 7. Rd1 Bd7 12. -2.48 4 3835796 1. ... hxg5 2. Bb3 Be6 3. Rac1 Rc6 4. Ba4 Rcc8 5. R xc8 Rxc8 6. Kh1 Rc7 7. Rd1 Bd7 node_count = 4136960 quiescent nodes = 1295733 eval_count = 3828947 hash hits = 134394 hash moves = 45523 pawn hash hits = 3737794 node_rate = 825740 null cuts = 248276 exten = 94534 int_iter = 7067 egtb_probes = 0 egtb_hits = 0 fail_high(%) = 92 So the quiescent nodes are now 31.3% of the tree.
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