0.d - Download - 8/25/2006.Features:
0.c - Download - 8/19/2006.
0.b - Download - 8/16/2006.
0.a - Download - 8/13/2006.
-Will not use more than 1/5th of it's time no matter whatTourny 0d
Rank Engine Score Ce Ex Ro Ed Mu Ex S-B 1 Cefap 7.0/10 · · =0 == 11 11 1= 31.00 2 Exacto 5.5/10 =1 · · 10 1= 10 0= 28.75 3 Roce345 5.0/10 == 01 · · 01 01 01 25.00 4 Eden_0.0.10 5.0/10 00 0= 10 · · 11 1= 21.00 5 Murderhole 4.0/10 00 01 10 00 · · 11 17.50 6 Exacto-0.c 3.5/10 0= 1= 10 0= 00 · · 19.25
30 games played / Tournament is finished
Tournament start: 2006.08.25, 01:00:58
Latest update: 2006.08.25, 07:24:25
Site/ Country: KIT, United States
Level: Blitz 2/6
Hardware: Intel(R) Celeron(R) M processor 1.30GHz with 480 MB Memory
Operating system: Microsoft Windows XP Professional Service Pack 2 (Build 2600)
-Will not trust the hash table in ID if making the move creates a draw, in this case, it will start over at depth = 1
-New commands:
null - toggles null-move pruning (default on)
iid - toggles iid (default on)
posonly - toggles searching of positive captures only in qsearch (default off)
fp - toggles futility pruning (default off)
pfnfp - toggles pre-frontier node futility pruning (default off)
razor - toggles razoring (default off)
razorverify N - verifies razor depth reductions with a q_search at DEPTH >= N (default 4)
razorcondition N - number of pawns below alpha for which to razor (default 3)
-Switched to verified null-move pruning (R = 3)
-New command "hash x" redimensions hash table to occupy x megabytes of ram (same as "dimtable x")
-Revised move ordering (large performance increase)
-Debugged futility pruning, off by default
-Debugged pre-frontier node futility pruning, off by default
-Somewhat debugged razoring, off by default
-Fixed divide by 0 bug (I think)
-Fixed a bug after ECM142 when searching ECM143
-Crashed on ECM 629, but I can't seem to reproduce the crash
-Increased penalty for advanced queen
-Tweaked move ordering to discourage queen movements also
-Added open-file and advanced-rank bonuses for rooks
-Changed center-of-mass to recognize rank of CM instead of ev_square_val[CM]
-Altered attack-on-king penelty formula, now capped at 4/5 a pawn (was causing problems)
-Default hash size is now 10 megabytes instead of 1 megabyte
0.b-Added new command: dimtable x, where x is the desired size of the hash table in megabytesTourny 0c
Rank Engine Score Sh Ce Ed Br Mu Ex Ro Ex S-B 1 Sharper 14.0/14 · · 11 11 11 11 11 11 11 84.00 2 Cefap 8.5/14 00 · · =1 11 == 1= =0 11 47.00 3 Eden_0.0.10 7.0/14 00 =0 · · 10 1= 1= =1 10 39.25 4 Braincrack 7.0/14 00 00 01 · · 10 11 10 11 35.00 5 Murderhole 6.0/14 00 == 0= 01 · · 00 =1 11 31.50 6 Exacto 6.0/14 00 0= 0= 00 11 · · 1= =1 31.00 7 Roce345 5.0/14 00 =1 =0 01 =0 0= · · 01 31.75 8 Exacto-0.a 2.5/14 00 00 01 00 00 =0 10 · · 15.00
56 games played / Tournament is finished
Tournament start: 2006.08.18, 20:19:25
Latest update: 2006.08.19, 10:31:45
Site/ Country: KIT, United States
Level: Blitz 2/6
Hardware: Intel(R) Celeron(R) M processor 1.30GHz with 480 MB Memory
Operating system: Microsoft Windows XP Professional Service Pack 2 (Build 2600)
-Debugged setboard 'FEN' command
-Division by zero
-Does not recognize draws by insufficiant material
-Removed hash table suggestion storage on UPPERBOUND nodes
-Upgraded passed pawn handling (higher value closer to promotion)
-Fixed a catastrophic bug in zobrist key generation, this should:
-Fix false-positive draw detection
-Debug hash table based pruning
-Improve move ordering
-Pruning based on hash table
-Moves immediately if there is only one legal move
-Time management tweaks:
-Break the ID loop if time left is less than 80% of (average branching factor in this position times previous time)
-Use TIME/30 instead of TIME/25 for time limit of search
-Finish an iteration if the root ply is more than 80% complete
-This should result, in most positions, in less occurances of starting but not finishing a search
-Added single response to check extensions
-Added recapture extensions
-Fixed a bug which caused crashes after a Winboard game0.a
-Moves immediately if a forced mate variation is found
-Fatal position: 8/p1R3p1/8/3ppk2/3p3p/3P1P1P/5P2/1r3K2 w - - 0 0
This may be related to false-positive draw detection
-I think I fixed it
-Tweaked time management:
- If time_left < (3/2)*time_last_it, break inside of ID.
- Fixed a bug (continues if > 80% instead of < 80% on ply 0)
-Extreme makeover: Eval edition
- Cut all current bonuses in half
- Square values are cut in half again if they obstruct a pawn
- Queen movement discouraged
- Tweaked king safety bonus for pawn shields
- Recognize who has the passed pawn nearest promotion
- Decreased minor piece center of mass bonus (now 1/4 of former)
- Other tweaks to pawn structure eval
-Better time management:
- If time left < time for last iteration, break inside of ID.
- If time runs out, & 80% through the moves on ply 0 (with >= 1m initial time on this search), finishes searching.
-Legal move generation with perft and divide
-Returns principle variation
-PVS algorithm
-Q_Search, for tactical strength
-Crude support of the Winbord 2.0 protocal
-Hash tables for move ordering, but no pruning
-Null move forward pruning, futility pruning
-Internal iterative deepening