Bug in Strategic Test Suite (STS 11)

[rvida]

STS 11 - King activity - position #99:

Code: Select all

r5k1/4pp1p/6p1/3q4/1P6/r1P2P2/PKR1Q1PP/R7 w - - bm Kc1; c0 "Kc1=10, Kb1=3, Kb1=9"; id "STS(v11.0) King Activity.099";

Score for move Kb1 is ambiguous

[Eelco de Groot]

STS 11 - King activity - position #99:

Code: Select all

r5k1/4pp1p/6p1/3q4/1P6/r1P2P2/PKR1Q1PP/R7 w - - bm Kc1; c0 "Kc1=10, Kb1=3, Kb1=9"; id "STS(v11.0) King Activity.099";

Score for move Kb1 is ambiguous

Maybe 9 is a bit much because the score is not so high as for Kc1. 6 or 7 seems better but don't know how Swami measured that.

Best four moves:

[d]r5k1/4pp1p/6p1/3q4/1P6/r1P2P2/PKR1Q1PP/R7 w - -

Engine: Rainbow Serpent 1.8(s)dc Build 100 (Athlon 2009 MHz, 256 MB)
by Tord Romstad, Marco Costalba, Joona Kiiski

25 148:11 +0.68 1.Kc1 Qg5+ 2.Qd2 Qh4 3.Qe3 Qxh2
4.Qxe7 (5.129.799.189) 576

25 148:11 +0.35 1.Kb1 e6 2.h3 Rd8 3.g4 Rc8 4.Qe4 Qb5
5.Kb2 Rca8 6.Re2 Qa6 7.Rd2 Rxa2+
8.Rxa2 Qxa2+ 9.Kc1 Qa1+ 10.Kc2 Rc8 (5.129.799.189) 576

25 148:11 0.00 1.g4 Rxa2+ 2.Rxa2 Rxa2+ 3.Kb1 Ra3
4.h4 Qb3+ 5.Kc1 Ra1+ 6.Kd2 Qd5+
7.Ke3 Qe5+ 8.Kd3 Qd5+ 9.Ke3 (5.129.799.189) 576

25 148:11 0.00 1.Rd2 Rxa2+ 2.Rxa2 Rxa2+ 3.Kc1 Ra1+
4.Kc2 Ra2+ 5.Kc1 (5.129.799.189) 576

best move: Rc2-d2 time: 150:55.203 min n/s: 577.067 nodes: 5.225.464.820

[Dann Corbit]

STS 11 - King activity - position #99:

Code: Select all

r5k1/4pp1p/6p1/3q4/1P6/r1P2P2/PKR1Q1PP/R7 w - - bm Kc1; c0 "Kc1=10, Kb1=3, Kb1=9"; id "STS(v11.0) King Activity.099";

Score for move Kb1 is ambiguous

Thanks. I'll give it a once over and find out a good score for the second king move.

These oddities come about because two strong engines had different opinions after a good, long think. Usually, I just take the strongest one if the evaluations are very close. When they are that far apart I usually re-analyze. In this case, I simply failed to notice it.