spsa 6250 iterations

[Ciekce]

STC of slightly different values (wrong probcut margin, and un-hand-tuned sbeta)

Elo   | 14.25 +- 6.73 (95%)
SPRT  | 13.0+0.13s Threads=1 Hash=32MB
LLR   | 2.90 (-2.25, 2.89) [0.00, 5.00]
Games | N: 2928 W: 729 L: 609 D: 1590
Penta | [17, 292, 728, 408, 19]

https://chess.swehosting.se/test/7017/

Elo   | 17.67 +- 7.36 (95%)
SPRT  | 65.0+0.65s Threads=1 Hash=32MB
LLR   | 2.89 (-2.25, 2.89) [0.00, 5.00]
Games | N: 2184 W: 548 L: 437 D: 1199
Penta | [6, 205, 557, 320, 4]

https://chess.swehosting.se/test/7018/

tune: https://chess.swehosting.se/tune/6969/ (nice)