Author: Dieter Buerssner
Date: 01:21:52 09/27/00
Go up one level in this thread
On September 26, 2000 at 16:51:33, Uri Blass wrote:
>[D]3r3k/p7/1p6/2p2Q1p/2P1R3/2P5/P2KP3/6q1 w - - 0 1
>
>Hiarcs played Kc2 and had to resign some moves later because the queen cannot be
>saved[the game continued Kc2 Qd1+ Kb2 Rd2+ Ka3 Qc1+ Ka4 b5+ cxb5 Qc2+ Ka5 Qxc3+
>and white resigned because of the line Ka6 Rd6+ Kb7 Qg7+ Kb8(forced because Kc8
>is leading to mate) Rd8+].
>
>How much time do programs need to avoid this tactical error?(some program like
>hiarcs can play Rd4 after a short time but later change their mind to Kc2 so the
>right test is to give them at least some minutes)
Interesting position. I think, it is not unlikely for many engines to switch
moves here. It needs some relatively deep search to see that the queen is lost.
Before this, Yace sees tactical strong lines after Kc2, but in between, at just
one depth, they seem to be refuted.
Yace needs 64 seconds on AMD K6-2 475 MHz, 30MB hash.
[...]
8756 0.131 -1.43 4t : Re4d4 Rd8xd4+ c3xd4 Qg1xd4+ Kd2e1 Qd4c3+ Ke1f2
Qc3xc4 Qf5xh5+ Kh8g8 [-100]
[stays with Rd4 until]
3464157 16.90 -0.66 10t : Re4d4 Rd8xd4+ c3xd4 Qg1xd4+ Kd2e1 Qd4h4+ Ke1f1
Qh4xc4 Qf5xh5+ Kh8g8 Qh5e8+ Kg8g7 Qe8e5+ Kg7g6
Qe5d6+ Kg6f5 Qd6d7+ Kf5e5 Qd7xa7 Qc4c1+ Kf1f2
b6b5 [0]
[...]
9973064 53.77 -0.36 10t : Kd2c2 Qg1d1+ Kc2b2 Rd8d2+ Kb2a3 Qd1c1+ Ka3a4
b6b5+ c4xb5 Qc1c2+ Ka4a5 Qc2xc3+ Ka5a6 Rd2d6+
Ka6b7 Qc3g7+ Kb7c8 Qg7g8+ Kc8b7 Rd6b6+ Kb7c7H
Qg8b8+H Kc7d7H Rb6d6+H Kd7e7H <HT> [0]
[... at depth 11 Kc2 fails low, the "+PV" does not make sense. This is just the
sequence of moves, that failed high in zero window search]
11892618 63.51 -0.85 11t+: Re4d4 Rd8xd4+ c3xd4 Qg1xd4+ Kd2e1 Qd4h4+ Ke1f1
Qh4xc4 Qf5xh5+ Kh8g8 Qh5e8+ Kg8h7 Qe8e7+ Kh7g6
Qe7xa7 Qc4xa2 Qa7xa2 Kg6f6 [900]
14101814 74.00 -0.66 11t : Re4d4 Rd8xd4+ c3xd4 Qg1xd4+ Kd2e1 Qd4h4+ Ke1f1
Qh4xc4 Qf5xh5+ Kh8g7 Qh5e5+ Kg7f7 Qe5c7+ Kf7e6
Qc7xa7 Qc4c1+ Kf1f2 Qc1f4+ Kf2e1 Qf4h4+ Ke1f1
Qh4f6+ Kf1g2 Qf6g5+ Kg2f1 [0]
[and stays with Rd4 for at least 500 sceonds]
98549418 497.5 -0.63 14. : Re4d4 Rd8xd4+ c3xd4 Qg1xd4+ Kd2e1 Qd4h4+ Ke1f1
Qh4xc4 Qf5xh5+ Kh8g7 Qh5e5+ Kg7g6 Qe5d6+ Kg6f5
Qd6d7+ Kf5e4 Qd7g4+ Ke4d5 Qg4d7+ Kd5e5 Qd7g7+
Ke5d6 Qg7xa7 Qc4f4+ Kf1g2 Qf4g5+ Kg2f2 Qg5f6+
Kf2e3 Qf6e5+ Ke3d2 Qe5d4+ Kd2e1 <HT> [0]
Also it's a pretty save bet, that Kc2 won't be considered again, because after
that move a score of > 9.0 is shown soon (after fail high, fail low, fail high,
fail high).
-- Dieter
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