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[D]3r4/p6k/4p1rp/1pp1Pp2/2pN3R/4PQ1R/P2K2PP/1q6 b - - 0 1

The Mephisto Travel Expert takes about 5 minutes to find.........c3+

(black plans to open up the c file for the rook later on)...

I wonder how the Mach 3 and some others do on this one....

regards

Robert

a recently posted young & raw engine, but on modern hardware --

Analysis by Daydreamer 1.0:

1...cxd4 2.Qb7+ Kg8 3.Rxd4 Qxa2+ 4.Kc1 Qa1+ 5.Kc2 Rxd4 6.exd4 Qxd4
-+ (-2.45) Depth: 6 00:00:00 67kN
1...cxd4 2.Qb7+ Kg8 3.Rxd4 Qxa2+ 4.Kc1 Qa1+ 5.Kc2 Rxd4 6.exd4 Qxd4
-+ (-2.45) Depth: 7 00:00:00 158kN
1...cxd4 2.Qb7+ Kg8 3.Rxd4 Qxa2+ 4.Ke1 Rxd4 5.exd4 Qa1+ 6.Kf2 Qxd4+ 7.Re3
-+ (-2.40) Depth: 8 00:00:00 301kN
1...cxd4 2.Qb7+ Kg8 3.Rxd4 Rd5 4.Qa8+ Kh7 5.Rxh6+ Rxh6 6.Qxa7+ Kg6 7.Rxd5 Qb2+ 8.Kd1 exd5
-+ (-4.05) Depth: 9 00:00:03 2551kN
1...cxd4 2.Qb7+ Kg8 3.Rxd4 Qxa2+ 4.Kc1 Qa1+ 5.Kc2 Rxd4 6.exd4 Qxd4 7.Qa8+ Kf7 8.Qb7+ Kf8
-+ (-2.45) Depth: 10 00:00:06 4968kN
1...cxd4 2.Qb7+ Kg8 3.Rxd4 Rxd4+ 4.exd4 Qxa2+ 5.Ke1 Rxg2 6.Rg3+ Rxg3 7.Qc8+ Kh7 8.hxg3 Qa1+ 9.Ke2 Qxd4 10.Qxe6
-+ (-2.70) Depth: 11 00:00:27 20922kN
1...cxd4 2.Qb7+ Kg8 3.Rxd4 Rxd4+ 4.exd4 Qxa2+ 5.Ke1 Rxg2 6.Qxg2+ Qxg2 7.Rg3+ Qxg3+ 8.hxg3 c3 9.Kd1 Kf7 10.Kc2
-+ (-2.90) Depth: 12 00:00:54 41108kN
1...cxd4 2.Qb7+ Kg8 3.Rxd4 Rxd4+ 4.exd4 Qb2+ 5.Kd1 Qxd4+ 6.Kc2 Qf2+ 7.Kc3 Qe1+ 8.Kc2 Qe2+ 9.Kc3 Qxe5+ 10.Kb4 Qb2+ 11.Kc5 Qxa2 12.Kxb5 Rxg2 13.Rxh6
-+ (-3.00) Depth: 13 00:02:13 103mN
1...c3+ 2.Ke2 Qxa2+ 3.Kf1 c2 4.Ne2 Qb2 5.Qb7+ Kg8 6.Rc4 Qb1+ 7.Kf2 bxc4 8.Qc7 Qd1 9.Rg3 Rxg3 10.Nxg3
-+ (-4.70) Depth: 13 00:03:08 147mN

(D, Microsoft 19.08.2009)

not sure why daydreamer needs so much depth though. all the other engines i tested found it close to instantly around depth 8.

rightrook wrote:[D]3r4/p6k/4p1rp/1pp1Pp2/2pN3R/4PQ1R/P2K2PP/1q6 b - - 0 1

Hi Rob

The Excel Mach III first chooses c3+ but then quickly changes to Rxg2+
then ..after 1 min 44 sec and 4 ply it returns to c3+ and sticks with it

perhaps i should have challenged the Forum with the Mach III Instead


Best Regards
Steve

OK..thanks Steve.......Very good...!

I remember the 1 or 2 ply level on Mach III as being pretty fantastic...

It (the lower level) would often find the correct move... then change to something else......then come back to the right move again....



regards

Rob

It took Plisk 5 and a half minutes and depth 11 to find the move and stick with it. I think the problem is my branching factor which is almost 4. If I could only lower that...



2 0:0 +6.94 1... Rxg2+ 2.Qxg2 Qxa2+ 3.Ke1 (742/46)
3 0:0 +6.94 1... Rxg2+ 2.Qxg2 Qxa2+ 3.Ke1 (4639/289)
4 0:0 +6.00 1... Rxg2+ 2.Qxg2 Qxa2+ 3.Ke1 Qxg2 4.Rxh6+ Kg8 (23802/506)
5 0:0 +7.05 1... Rxd4+ 2.Rxd4 Rxg2+ 3.Qxg2 Qxa2+ 4.Kc1 Qxg2 (96010/768)
6 0:0 +5.71 1... Rxg2+ 2.Qxg2 Qxa2+ 3.Ke1 Qxg2 4.Rxh6+ Kg8 5.Rh8+ Kf7 6.Rh7+ Kg8 (348484/893)
7 0:1 +5.63 1... Rxg2+ 2.Qxg2 Qxa2+ 3.Ke1 Qxg2 4.Rxh6+ Kg8 5.Rh8+ Kf7 6.Rh7+ Kg8 7.Nxb5 (1051303/1005)
8 0:3 +4.94 1... Rxg2+ 2.Qxg2 Qxa2+ 3.Ke1 Qxg2 4.Rxh6+ Kg8 5.Rh8+ Kf7 6.Rh7+ Kg6 7.Rh6+ Kf7 8.Rxd8 (3914856/1067)
9 0:14 +5.82 1... cxd4 2.Rxh6+ Rxh6 3.Qb7+ Kg8 4.Rg3+ Kf8 5.Qg7+ Ke8 6.Qg8+ Kd7 7.Qg7+ Kc6 8.Qxh6 c3+ 9.Ke2 (15250729/1023)
10 1:13 +5.15 1... Rd7 2.Rg3 Rxg3 3.hxg3 c3+ 4.Ke2 cxd4 5.exd4 Qxa2+ 6.Kf1 b4 7.g4 (74105795/1013)
11 5:21 +6.73 1... c3+ 2.Ke2 cxd4 3.Rxh6+ Rxh6 4.Qb7+ Kg8 5.Rg3+ Kf8 6.Qg7+ Ke87.Qxh6 d3+ 8.Kf2 Qxa2+ 9.Kg1 Qb1+ 10.Kf2 Qc2+ 11.Kg1 (323527122/1006)
12 10:0 +6.84 1... c3+ 2.Ke2 cxd4 3.Rxh6+ Rxh6 4.Qb7+ Kg8 5.Rg3+ Kf8 6.Qg7+ Ke87.Qxh6 d3+ 8.Kf2 Qxa2+ 9.Kf3 Qe2+ 10.Kf4 Qf2+ 11.Rf3 Qxg2 (601180155/1001)
c3+ - Correct(c3+) - Analyzed 1/1 - Correct 1/1 (100.00%)
gen> nNodes: 534969660 nQSNodes: 66210495 branchFactor: 3.88 avgDepth: 13.0
ext> nExt: 62906949 nCheckExt: 62336669 nPromExt: 795769 nPawnOnlyExt: 38943 nOneMoveExt: 0

Regards,
Vlad