I tried Valkyria with the iterative deepening on this position and
with the help of the best move hash table it basically solves it.
After 1001 playouts win rate is 24.6%
At iteration 6 and total 36857 playouts win rate drops to 4.8% and
when I stopped search win rate was 0.2%.
It searched doing 2400 playouts per second.
This means that playouts has trouble evaluating this initially
although it is clear the position is one sided.
Only winning moves are stored in the hash table (since the losing side
will search many moves in lost positions anyway I do not see any
benefit of storing best losing moves in the table so there is a win
rate threshold for that).
Remember that for each iteration the tree is deleted so this is a
really nice demonstration that the hash table works well when a
position is researched and it is a hard one for the playouts.
.
..0.. <e9/246/528> Hits: 0 1001/1001 Misses: 601
..1.. <e9/281/965> Hits: 38 1275/2276 Misses: 761
..2.. <e9/156/1186> Hits: 69 2268/4544 Misses: 1381
..3.. <e9/126/3560> Hits: 127 4289/8833 Misses: 2541
..4.. <e9/149/7675> Hits: 259 8579/17412 Misses: 5174
..5.. <e9/122/7656> Hits: 253 8580/25992 Misses: 5189
..6.. <e9/48/6604> Hits: 332 10865/36857 Misses: 6641
..7.. <e9/45/11410> Hits: 635 20675/57532 Misses: 12701
..8.. <e9/21/25080> Hits: 926 30808/88340 Misses: 18521
..9.. <e9/14/38822> Hits: 1498 49663/138003 Misses: 29961
..10.. <j7/43/44784> Hits: 1410 49664/187667 Misses: 30421
..11.. <e9/10/66987> Hits: 2425 80515/268182 Misses: 48501
..12.. <j7/11/93257> Hits: 4400 145501/413683 Misses: 88001
..13.. <j7/7/66607> Hits: 4535 153352/567035 Misses: 90701
..14.. <e9/3/121875> Hits: 5765 193986/761021 Misses: 115301
18 PLY VAR B j7 W g8 B e9 W h2 B f7 W g4 B f9 W a6 B a5 W a4 B a7 W a5
B f2 W h1 B c3 W c2 B g2 W e1
Best
Magnus
Quoting Ingo Althöfer <[email protected]>:
"Aja" <[email protected]>
ManyFaces (White) still wins even if it loses the semeai but captures
the J4 group of 3 stones. And it's not possible for Black to save the
J4 group and win the semeai at the same time.
Yes, that is exactly what the experts in the forum found.
The question: Do the other bots see this as well,
and how early in the game do they see this outcome?
Ingo.
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