GNU Go

Revised patch

Replying to gunnar: There's a rather bad breakage for gunnar_7_12.8 on the normal regressions: The typical problem can be examplified with semeai:73. In this position the patch changes the three white stones from a lunch to an eyespace. ... [More] As a consequence black is found to have two eyes and claims life, whereas white doesn't look alive, so the semeai is statically evaluated as a full win for black. [Less]

Replying to gunnar: There is no breakage on the standard regressions for gunnar_7_12.7 and a small increase in reading nodes ( 0.089% 0.21% -0.041%). On STS-RV the result is five passes and no fails. The patch gunnar_7_12.7b has a mixed ... [More] breakage with 6 passes and 5 fails on the normal regressions plus increasing the owl nodes by 0.7%. On STS-RV it adds one more pass for STS-RV_1:58. The more complicated patch gunnar_7_12.7c retains the pass for STS-RV_1:58 but without any breakage on the normal regressions and the same node cost as gunnar_7_12.7. [Less]

Replying to cisba: Replying to gunnar: I don't think this test should go into blunder.tst since that is reserved for moves that are so bad that passing is better. This is more a of a normal mistake. :-) Ok. Where to put it? The ... [More] big unsolved problem of computer science - The Naming of Things. I don't have any particularly good place to suggest. There are only a few test files with a clear purpose, and I don't think it fits any of them. Maybe it could be added to strategy5.tst or tactics1.tst. Additionally a complementary "owl_attack N9" test could be added to owl1.tst. [Less]

Don't amalgamate dragons over three liberty strings or a specific class of two liberty strings.

Replying to gunnar: I don't think this test should go into blunder.tst since that is reserved for moves that are so bad that passing is better. This is more a of a normal mistake. :-) Ok. Where to put it?

There's a rather bad breakage for gunnar_7_12.8 on the normal regressions: owl:123 PASS 1 C5 [1 C5] trevorb:590 PASS M9 [H12|M9] semeai:73 FAIL 1 1 PASS [1 0 PASS] semeai:74 FAIL 0 0 PASS [1 0 (PASS|L13)] semeai:75 ... [More] FAIL 1 1 PASS [1 0 PASS] semeai:76 FAIL 0 0 PASS [1 0 (PASS|N3|K2)] semeai:77 FAIL 1 1 PASS [1 0 PASS] semeai:78 FAIL 0 0 PASS [1 0 (PASS|A6|C6|C1)] semeai:79 FAIL 1 1 PASS [1 0 PASS] semeai:80 FAIL 0 0 PASS [1 0 (PASS|E9|E8|J9|H5)] owl1:279 PASS 1 PASS [1 PASS] century2002:180 FAIL O11 [T9] auto_handtalk:3 FAIL 1 T15 [2 T15] gunnar:101 PASS T8 [T8] thrash:23 FAIL J6 [A5|D7] 13x13b:21 FAIL J13 [K11] seki:1106 FAIL C9 [C1] seki:2050 FAIL dead [alive] 4 PASS 14 FAIL Total nodes: 1704626871 3334488 12416594 ( 0.1% -0.03% 0.02%) For STS-RV it's rather the opposite, 14 passes, 2 fails: STS-RV_1:3 PASS 1 1 D8 [1 1 (D8|C3|B3|A3)] STS-RV_1:5 PASS 1 1 M4 [1 1 (M4|N4|R3|R2|R1)] STS-RV_1:20 PASS 1 1 T3 [1 1 (R3|S4|S2|T3)] STS-RV_1:54 PASS 1 0 O2 [1 0 (O2|O1|R2|Q1|S1)] STS-RV_1:59 PASS 0 0 PASS [0 0 PASS] STS-RV_1:158 PASS 1 1 P6 [1 1 (N3|O5|P6|Q6|R6|S6|T6)] STS-RV_1:160 FAIL 0 0 PASS [1 1 (N17|017|O16|O15|O14|R13|T12)] STS-RV_1:205 PASS 1 1 C2 [1 1 C2] STS-RV_Misc:4 PASS 1 1 A10 [1 1 A10] STS-RV_Misc:9 PASS 1 1 J1 [1 1 J1] STS-RV_Misc:14 PASS 1 0 B9 [1 0 B9] STS-RV_Misc:35 PASS 1 1 J1 [1 1 J1] STS-RV_Misc:42 PASS 1 0 A9 [1 0 A9] STS-RV_Misc:44 PASS 1 0 B9 [1 0 B9] STS-RV_RH:67 FAIL 0 0 PASS [1 1 B4] STS-RV_e:2 PASS 1 1 B17 [1 1 B17] [Less]

Do some more distrusting of tactical moves in semeai reading.

Don't play outer liberties in recognized eyespace.

Don't amalgamate dragons over two liberty strings (probably not a good idea).