Author: Miguel A. Ballicora
Date: 09:00:02 03/06/02
Go up one level in this thread
On March 06, 2002 at 11:01:26, John Merlino wrote:
>On March 06, 2002 at 03:20:11, Uri Blass wrote:
>
>>On March 05, 2002 at 21:16:51, Steve wrote:
>>
>>>On March 05, 2002 at 00:10:46, John Merlino wrote:
>>>
>>>>On March 04, 2002 at 22:25:28, Sally Weltrop wrote:
>>>>
>>>>>On March 04, 2002 at 22:23:28, Sally Weltrop wrote:
>>>>>
>>>>>>[D]6k1/6pp/2qb4/8/2pQrNN1/1p3RPP/5P1K/r1B5 w - - 0 36
>>>>>>
>>>>>>of course 36)Qxa1 and Black resigns next move!
>>>>>
>>>>>
>>>>>this is taken from the 9th rd of Linares 2002
>>>>>
>>>>>Shirov,A (2715) - Ivanchuk,V (2717) [C88]
>>>>>Linares SuperGM Linares (9), 04.03.2002
>>>>>
>>>>>1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 0-0 8.a4 Bb7 9.d3
>>>>>Re8 10.Nbd2 Bf8 11.c3 Na5 12.Ba2 c5 13.d4 d6 14.b4 exd4 15.bxa5 dxc3 16.Nf1 Nxe4
>>>>>17.axb5 axb5 18.a6 Bc6 19.Rxe4 Bxe4 20.Bxf7+ Kxf7 21.Ng5+ Kg8 22.Nxe4 Qc8
>>>>>23.Nxc3 Rxa6 24.Rb1 b4 25.Nd5 Ra7 26.Rb3 Ra1 27.h3 Re5 28.Nf4 Qe8 29.Rf3 c4
>>>>>30.Kh2 b3 31.Qd2 d5 32.Ne3 Bd6 33.g3 Qc6 34.Ng4 d4 35.Qxd4 Re4 36.Qxa1 1-0
>>>>
>>>>Two blunders in a row! (perhaps a victim of time pressure heading towards time
>>>>control?)
>>>>
>>>>After 34.Ng4, Ivanchuk is clearly in the lead:
>>>>
>>>>Time Depth Score Positions Moves
>>>>0:00 1/3 -1.86 1524 34...Rf5 35.Qc3 Ra2 36.Ne6
>>>>0:00 1/4 -2.47 6025 34...Rf5 35.Qc3 Ra2 36.Rd3 Rc2
>>>>0:00 2/5 -2.31 21581 34...Rf5 35.Bb2 Ra2 36.Ne3 Rxf4
>>>> 37.gxf4
>>>>0:00 2/6 -1.98 64702 34...Rf5 35.Qc3 Ra7 36.Bb2 Bxf4
>>>> 37.Rxf4 Rxf4 38.gxf4
>>>>0:02 3/7 -1.90 217927 34...Rf5 35.Qc3 Ra7 36.Ne6 Rxf3
>>>> 37.Qxf3 Bb4 38.Nd4 Qd6
>>>>0:08 3/8 -1.47 707718 34...Rf5 35.Qc3 Ra7 36.Ne6 Rxf3
>>>> 37.Qxf3 h5 38.Nd4 Qc5
>>>>0:40 4/9 -1.49 3345172 34...Rf5 35.Qc3 Ra7 36.Ne3 Be5
>>>> 37.Qb4 Rff7 38.Nexd5 Bxf4 39.Nxf4
>>>> Qxf3 40.Qb8+ Rf8 41.Qxa7
>>>>2:45 4/10 -1.51 14440411 34...Rf5 35.Qc3 Ra7 36.Ne6 Rxf3
>>>> 37.Qxf3 h5 38.Ne5 Bxe5 39.Qf8+
>>>> Kh7 40.Qf5+ g6 41.Qxe5
>>>>
>>>>But when the game is over....
>>>>
>>>>Time Depth Score Positions Moves
>>>>0:00 1/3 3.38 3069 36...Re1 37.Nh5 Qb7 38.Ne3
>>>>0:00 1/4 3.50 10479 36...Re1 37.Nh5 Qb7 38.Qa5 Qxf3
>>>> 39.Qxe1
>>>>0:00 2/5 3.28 34108 36...Re1 37.Nh5 Qb7 38.Kg2 Bb4
>>>> 39.Qb2
>>>>0:01 2/6 5.73 116307 36...Re1 37.Qxg7+ Kxg7 38.Nh5+
>>>> Kh8 39.Bb2+ c3 40.Bxc3+ Qxc3 41.Rxc3
>>>> Re8 42.Rxb3 Re2
>>>>0:01 2/6 4.06 165811 36...Re7 37.Kg2 Re1 38.Nh5 Bf8
>>>> 39.Qc3 Qe6 40.Ne3
>>>>0:02 2/6 3.96 190722 36...Rxf4 37.Rxf4 Bxf4 38.Bxf4
>>>> c3 39.Ne5 Qc5 40.Qa8+ Qf8
>>>>0:04 3/7 4.00 355447 36...Rxf4 37.Rxf4 Bxf4 38.Bxf4
>>>> c3 39.Qd1 Qb7 40.Qd8+ Kf7 41.f3
>>>>0:07 3/8 4.87 709846 36...Rxf4 37.Rxf4 Bxf4 38.Bxf4
>>>> c3 39.Qa7 h5 40.Be5 Qg6 41.Qb8+
>>>> Kh7 42.Qxb3 hxg4 43.Qxc3 gxh3 44.Kxh3
>>>> Qh5+ 45.Kg2
>>>>0:32 3/8 4.76 2874367 36...Qb7 37.Bb2 h5 38.Ne3 Bxf4
>>>> 39.Rxf4 Rxf4 40.gxf4 Qe4 41.Bxg7
>>>> Qxf4+ 42.Kg1
>>>>0:54 3/8 4.71 4928413 36...Bxf4 37.Bxf4 Re6 38.Ne5 Qd5
>>>> 39.Kg2 Rb6 40.Qb2
>>>>1:41 4/9 5.06 9349513 36...Bxf4 37.Bxf4 Re6 38.Ne5 Qd5
>>>> 39.Kg2 Re7 40.Qc1 Rc7 41.Qb2
>>>>
>>>>ouch.... I don't feel so bad now when I hang a pawn.... ;-)
>>>>
>>>>jm
>>>
>>>14.4 million positions and a search depth of 4 ply? What am I missing?
>>
>>a lot of extension and a different definition.
>>
>>I believe that the real depth is 9
>>
>>The meaning of 4 is probably brute force depth
>>with no null move pruning and no other pruning.
>>
>>The meaning of 9 is probably the real depth when chessmaster used only the null
>>move algorithm to prune.
>>
>>The fact that usually in endgame I see x/x+1 numbers and not x/x+5
>>supports my opinion because I see no reason to prune less in the endgame
>>(The opposite-endgame are the best candidate for more pruning rules
>>unless you talk about null move pruning)
>>
>>Note that I did not write chessmaster so
>>I do not know if my guess is correct.
>>
>>Uri
>
>The first number IS the brute force depth. All possibilities of plies of that
>first number (in this case, 4) have been searched. The second number is the
>MINIMUM extension depth. This is why Chessmaster can report a Mate in 15 (29
>plies) at depth 2/5, as it has done in this position (in less than one second,
>no less ;-):
>
>[D]7k/2p3p1/4Q2p/p3n3/2pBP2P/2P3P1/1r2q3/5RK1 w
>
>Time Depth Score Positions Moves
>0:00 1/3 0.00 5111 1.Rf8+ Kh7 2.Qg8+ Kg6 3.Qe6+ Kh7
>0:00 1/4 0.00 23042 1.Rf8+ Kh7 2.Qg8+ Kg6 3.Qe6+ Kh7
>0:00 2/5 Mate15 57975 1.Rf8+ Kh7 2.Qg8+ Kg6 3.Rf6+ Kxf6
> 4.Qf8+ Ke6 5.Qe8+ Kd6 6.Bxe5+ Kc5
> 7.Bd4+ Kd6 8.Qd8+ Ke6 9.Qd5+ Ke7
> 10.Bc5+ Ke8 11.Qe6+ Kd8 12.Be7+
> Ke8 13.Bf6+ Kf8 14.Qe7+ Kg8 15.Qxg7#
>0:01 2/6 Mate15 106803 1.Rf8+ Kh7 2.Qg8+ Kg6 3.Rf6+ Kxf6
> 4.Qf8+ Ke6 5.Qe8+ Kd6 6.Bxe5+ Kc5
> 7.Bd4+ Kd6 8.Qd8+ Ke6 9.Qd5+ Ke7
> 10.Bc5+ Ke8 11.Qe6+ Kd8 12.Be7+
> Ke8 13.Bf6+ Kf8 14.Qe7+ Kg8 15.Qxg7#
>
Interesting. My program Gaviota finds Mate in 15, with the same sequence
of moves in 18 seconds on a PIV 1.4 Ghz. Also, at ply 6 and I am very happy with
that. The interesting part is that Gaviota requires ~2Mega positions
where CM requires only 100K. In this particular position CM's tree is
20-fold leaner! I will have to work hard on trimming the fat!
Signature[1]: 2f2af0dc
7k/2p3p1/4Q2p/p3n3/2pBP2P/2P3P1/1r2q3/5RK1 w - - 0 1
+-----------------+
| . . . . . . . k |
| . . x . . . x . |
| . . . . Q . . x |
| x . . . n . . . |
| . . x B o . . o |
| . . o . . . o . |
| . r . . q . . . |
| . . . . . R K . |
+-----------------+
legal moves available = 40
276 1 0.0 -10.67 Qe6-g8 Kh8xg8 Rf1-f2 Qe2-e1
Kg1-g2 Rb2xf2 Bd4xf2 Qe1xc3
785 1 0.0 +2.10 Rf1-f8 Kh8-h7 Qe6-g8 Kh7-g6
h4-h5 Qe2xh5 Qg8-e6 Kg6-h7
Bd4xe5
978 1: 0.0 +2.10 Rf1-f8 Kh8-h7 Qe6-g8 Kh7-g6
h4-h5 Qe2xh5 Qg8-e6 Kg6-h7
Bd4xe5
1551 2 0.0 +2.10 Rf1-f8 Kh8-h7 Qe6-g8 Kh7-g6
h4-h5 Qe2xh5 Qg8-e6 <EMPTY>
<-transp
2400 2: 0.0 +2.10 Rf1-f8 Kh8-h7 Qe6-g8 Kh7-g6
h4-h5 Qe2xh5 Qg8-e6 <EMPTY>
<-transp
10970 3 0.1 :-( Rf1-f8
19223 3 0.2 :-(
21978 3 0.2 :-(
97988 3 0.8 +0.00 Rf1-f8 Kh8-h7 Qe6-g8 Kh7-g6
Qg8-e6 Kg6-h7
99431 3: 0.8 +0.00 Rf1-f8 Kh8-h7 Qe6-g8 Kh7-g6
Qg8-e6 Kg6-h7
281747 4 2.4 +0.00 Rf1-f8 Kh8-h7 Qe6-g8 Kh7-g6
Qg8-e6 Kg6-h7
287259 4: 2.4 +0.00 Rf1-f8 Kh8-h7 Qe6-g8 Kh7-g6
Qg8-e6 Kg6-h7
698465 5 5.8 +0.00 Rf1-f8 Kh8-h7 Qe6-g8 Kh7-g6
Qg8-e6 Kg6-h7
734253 5: 6.1 +0.00 Rf1-f8 Kh8-h7 Qe6-g8 Kh7-g6
Qg8-e6 Kg6-h7
1706066 6 14.0 :-) Rf1-f8
1710738 6 14.0 :-) Rf1-f8
1790314 6 14.7 :-) Rf1-f8
1846161 6 15.1 :-) Rf1-f8
2273113 6 18.2 +Mat_15 Rf1-f8 Kh8-h7 Qe6-g8 Kh7-g6
Rf8-f6 Kg6xf6 Qg8-f8 Kf6-e6
Qf8-e8 Ke6-d6 <-transp
2301528 6: 18.4 +Mat_15 Rf1-f8 Kh8-h7 Qe6-g8 Kh7-g6
Rf8-f6 Kg6xf6 Qg8-f8 Kf6-e6
Qf8-e8 Ke6-d6 <-transp
4080652 7 31.6 +Mat_15 Rf1-f8 Kh8-h7 Qe6-g8 Kh7-g6
Rf8-f6 Kg6xf6 Qg8-f8 Kf6-e6
Qf8-e8 Ke6-d6 Bd4xe5 Kd6-c5
Be5-d4 Kc5-d6 Qe8-d8 Kd6-e6
Qd8-d5 Ke6-e7 Bd4-c5 Ke7-e8
Qd5-e6 Ke8-d8 Bc5-e7 Kd8-e8
Be7-d6 Ke8-d8 Qe6-e7 Kd8-c8
Qe7xc7
4185919 7: 32.4 +Mat_15 Rf1-f8 Kh8-h7 Qe6-g8 Kh7-g6
Rf8-f6 Kg6xf6 Qg8-f8 Kf6-e6
Qf8-e8 Ke6-d6 Bd4xe5 Kd6-c5
Be5-d4 Kc5-d6 Qe8-d8 Kd6-e6
Qd8-d5 Ke6-e7 Bd4-c5 Ke7-e8
Qd5-e6 Ke8-d8 Bc5-e7 Kd8-e8
Be7-d6 Ke8-d8 Qe6-e7 Kd8-c8
Qe7xc7
Regards,
Miguel
>jm
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