Run T-0200 rejected
· Evidence: SPRT Sequential probability ratio test. Games are played until the accumulated evidence reaches one of two bounds; then the test stops.
Hypothesis
Disabling the null move pruning probe when a friendly knight, bishop, rook, or queen is attacked by a less valuable opponent and eval minus beta is less than the piece-specific threshold (knight 220, bishop 230, rook 170, queen 400), while keeping all other null move gating and search heuristics unchanged, improves engine playing strength.
Wording edited for publication from the German entry; the register carries the author’s own text.
Stages
| Field | short stage |
|---|---|
| Verdict | rejected |
| Elo Strength difference to the opponent, estimated from the games, with a 95-percent half-width where the oracle reported one. Never an absolute rating. | −11.17 ± 6.32 |
| nElo Normalised Elo: the Elo difference divided by the spread of the game results, so that the SPRT bounds mean the same at different time controls. | −22.52 ± 12.73 |
| Games | 2,862 |
| Wins / draws / losses | 616 / 1,538 / 708 |
| pentanomial Games are played in pairs with swapped colours; the five counts are the pairs scoring 0, ½, 1, 1½ and 2 points. | 7 / 380 / 742 / 302 / 0 |
| LLR Log-likelihood ratio, the running evidence of an SPRT. It starts at 0; a stage passes at the upper bound and fails at the lower one. | −2.96 |
| Bounds | −2.94 … +2.94 |
| SPRT Sequential probability ratio test. Games are played until the accumulated evidence reaches one of two bounds; then the test stops. | [0.0, 5.0] |
| Error rates α / β | 0.05 / 0.05 |
| Model | normalized |
| time control Base time plus increment per move in seconds, e.g. 8+0.08: eight seconds per game plus 0.08 seconds per move. | 8+0.08 |
| Book | A |
| Opponent | vs predecessor |
| Duration | 21 min |
Provenance
- Date
- 2026-10-23
- Started
- 2026-10-22 23:19:30 UTC
- Duration
- 21 min
- Author
- Agent D
- Epoch
- 11
- Gatekeeper
- passed
- Bench nodes
- 683