KILOBYTECHESS
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Joseph's 15

by Joseph · Fifteen Hand-written

Play this bot

My attempt to create a chess bot with no more than 15 lines of code without using AI.

Live Elo
459
peak 538
Record
0-3-46
W-D-L in rated games
League
Fifteen (at most 15 non-blank lines, each at most 64 characters)
hand-written
Active version
v2
341 bytes

Rating history

low 100high 538

Calibrated rating

544 ± 393 Done ladder vs Stockfish · 2026-10-28 · v2

Highest rung passed—
Stopped at rung200
Performance rating (all ladder games)100 ± 393
Accuracy estimate766 (avg loss 270.7 cp, accuracy 69.0%)
Rungs and games
RungScoreGames (analysis)
200 0.5/3 ✗ #7371 #7372 #7373

Versions

VersionStatusSizeClassAgentsNotesUploaded
v2 active Passed self-test 341 BFifteen no 2026-10-27 21:26
v1 Failed self-test 341 BFifteen noMy first attempt. 2026-10-27 20:59

Head to head

OpponentWDL
QA Fifteen 0013
fifteen 029
Random Walker 015
Greedy Gus 003
large_bot 003
Deepseek Max Attempt 003
Mini Max 003
micro 001
QA Nano 001
QA Open 001
mini_bot 001
open_bot 001
Admin 001
fifteen_bot 001

By colour

ColourWDL
White0322
Black0024

All finished games, including unrated ones against people and the engine.

Recent games

#WhiteBlackResultMovesStatusWhen
8633 KiloNet (300) Joseph's 15 v2 (459) * 0 Aborted referee error 4 minutes ago
8431 micro v1 (743 +3) Joseph's 15 v2 (463 -3) 1-0 17 Finished checkmate 8 hours, 2 minutes ago
8417 Joseph's 15 v2 (473 -9) QA Nano v1 (492 +9) 0-1 16 Finished checkmate 8 hours, 2 minutes ago
8403 Joseph's 15 v2 (477 -1) QA Open v1 (1082 +1) 0-1 50 Finished checkmate 8 hours, 2 minutes ago
8384 mini_bot v1 (706 +4) Joseph's 15 v2 (477 -4) 1-0 17 Finished checkmate 8 hours, 2 minutes ago
8363 open_bot v1 (1200 +0) Joseph's 15 v2 (477 +0) 1-0 27 Finished checkmate 8 hours, 2 minutes ago
8224 Joseph's 15 v2 (520 -14) Greedy Gus v1 (327 +14) 0-1 98 Finished checkmate 8 hours, 34 minutes ago
8223 Greedy Gus v1 (327 +15) Joseph's 15 v2 (520 -15) 1-0 15 Finished checkmate 8 hours, 34 minutes ago
8222 Joseph's 15 v2 (520 -14) Greedy Gus v1 (327 +14) 0-1 38 Finished checkmate 8 hours, 34 minutes ago
8176 large_bot v1 (884 +2) Joseph's 15 v2 (527 -2) 1-0 21 Finished checkmate 8 hours, 34 minutes ago
8175 Joseph's 15 v2 (527 -2) large_bot v1 (884 +2) 0-1 30 Finished checkmate 8 hours, 34 minutes ago
8174 large_bot v1 (884 +2) Joseph's 15 v2 (527 -2) 1-0 21 Finished checkmate 8 hours, 34 minutes ago
8122 Deepseek Max Attempt v4 (1605 +0) Joseph's 15 v2 (527 +0) 1-0 37 Finished checkmate 8 hours, 34 minutes ago
8121 Joseph's 15 v2 (527 +0) Deepseek Max Attempt v4 (1605 +0) 0-1 10 Finished checkmate 8 hours, 34 minutes ago
8120 Deepseek Max Attempt v4 (1605 +0) Joseph's 15 v2 (527 +0) 1-0 47 Finished checkmate 8 hours, 34 minutes ago
8077 Mini Max v1 (691 +6) Joseph's 15 v2 (544 -6) 1-0 15 Finished checkmate 8 hours, 34 minutes ago
8076 Joseph's 15 v2 (544 -5) Mini Max v1 (691 +5) 0-1 56 Finished checkmate 8 hours, 34 minutes ago
8075 Mini Max v1 (691 +6) Joseph's 15 v2 (544 -6) 1-0 15 Finished checkmate 8 hours, 34 minutes ago
7646 Joseph's 15 v2 (100 +0) Random Walker v1 (100 +10) 0-1 168 Finished checkmate 1 day, 2 hours ago
7570 fifteen v2 (441 +2) Joseph's 15 v2 (108 +0) 1-0 85 Finished checkmate 1 day, 2 hours ago
7569 Joseph's 15 v2 (108) fifteen v2 (441) * 0 Aborted referee error 1 day, 2 hours ago
7568 fifteen v2 (441 +2) Joseph's 15 v2 (108 -3) 1-0 33 Finished checkmate 1 day, 2 hours ago
7567 Joseph's 15 v2 (114 -5) fifteen v2 (438 +3) 0-1 0 Finished Joseph's 15 v2 crashed: process exited … 1 day, 2 hours ago
7566 fifteen v2 (438) Joseph's 15 v2 (114) * 0 Aborted referee error 1 day, 2 hours ago
7565 Joseph's 15 v2 (114) fifteen v2 (438) * 0 Aborted referee error 1 day, 2 hours ago