Mate in 19

[F.Huber]

Sorry for you even more, Franz!

Now, that we found the correct postion, Zappa found an even shorter way even with another first move!

Hehe, you're right Peter, I could confirm it with ChestUCI.
Unfortunately the ThreatDepth is now only R-5 instead of R1 and also C2 isn't valid anymore, so the solution time is much longer:
4b3/1R2p3/1B6/1k1p4/pN2r1pp/Kpp2pnQ/1N5r/3B3q w - - bm #12; 04:02 @ C0/R-5/K2/P9/X38;

If we continue this way, maybe we'll end up in a mate below 10 ...

[F.Huber]

And here are 2 other mate problems I've got from Michael, which I also was not able to solve yet:

Mate in 15 ?
[D]4br1n/b7/Kp6/pp1R4/2N2pBk/2Bp1Pp1/1n2p1P1/1r1q4 w - -

Mate in 49 ?
[D]n4b1n/3Q2NK/3B1r2/4P3/5RPp/1P1P2kb/ppppp2p/5r1q w - -

I don't have any solutions nor do I know if these mates are correct at all.

[peter]

If we continue this way, maybe we'll end up in a mate below 10 ...

Mabe not quite this, Franz, but the study seems to be what's called cooked anyway.
Seems to me in the meantime, the author's solution is the longest one and the four others, I already have together with Zappa (o.k, its mate extensions are turned on ) all are shorter:

4b3/1R2p3/1B6/1k1p4/pN2r1pp/Kpp2pnQ/1N5r/3B3q w - - 0 1

Analysis by Zappa Mexico II:

1. +- (#12): 1.Ld4+ Ka5 2.Sc4+
2. +- (#14): 1.Lf2+ Ka5 2.Lb6+ Kb5 3.Ld4+ Ka5 4.Sc4+
3. +- (#14): 1.Le3+ Ka5 2.Lb6+ Kb5 3.Ld4+ Ka5 4.Lb6+
4. +- (#14): 1.La7+ Ka5 2.Sxd5 gxh3 3.Sxe7 cxb2 4.Tb8 Dxd1
5. +- (#16): 1.Lg1+ Ka5 2.Ta7+ Kb5 3.Lxh2 gxh3 4.Sxa4 Dxh2
6. = (0.00): 1.Dxg3 hxg3 2.La7+ Ka5 3.Lb6+ Kb5



Well and then its mv- output isn't quite correct as for the number of moves to mate of all of the variants.
Here is my pgn as far as I went to look for the 5 solutions I have till now.
Maybe we could make a contest out of the thread, instead of looking for an impossible mate let's look for some possible ones.


[Event "?"]
[Site "Dort"]
[Date "1992"]
[Round "?"]
[White "Murarasu, Ion"]
[Black "Problemist"]
[Result "1-0"]
[Annotator "Martan,Peter"]
[SetUp "1"]
[FEN "4b3/1R2p3/1B6/1k1p4/pN2r1pp/Kpp2pnQ/1N5r/3B3q w - - 0 1"]
[PlyCount "23"]

1. Bd4+ (1. Bg1+ Ka5 2. Qf1 (2. Bb6+ $6 Kb5 3. Bd4+ Ka5 4. Nc4+ dxc4 5. Bb6+
Kb5 6. Bf2+ Ka5 7. Qxh4 Rxh4 8. Bb6+ Kb5 9. Ba7+ Ka5 10. Bb8 Qg1 11. Bc7+ Qb6
12. Rxb6 Re6 13. Rxe6+ Kb5 14. Re5#) (2. Ra7+ $6 Kb5 3. Qf1+ Nxf1 4. Rb7+ Ka5
5. Bb6+ Kb5 6. Bf2+ Ka5 7. Ra7+ Kb5 8. Be2+ fxe2 9. Rb7+ Ka5 10. Bb6+ Kb5 11.
Bd4+ Ka5 12. Nc4+ dxc4 13. Bb6+ Kb5 14. Ba7+ Ka5 15. Bb8 Re6 16. Bc7+ Rb6 17.
Rxb6 Qg1 18. Ra6+ Kb5 19. Ra5#) 2... Nxf1 (2... Rhe2 $6 3. Bxe2 Nxe2 4. Ra7+
Kb5 5. Qb1 Rd4 6. Nxa4 b2 7. Qg6 b1=N+ 8. Qxb1 Rd1 9. Qxd1 Nf4 10. Nxc3+ Kc4
11. Qb3#) 3. Bb6+ Kb5 4. Bf2+ Ka5 5. Ra7+ Kb5 6. Be2+ fxe2 7. Rb7+ Ka5 8. Bb6+
Kb5 9. Bd4+ Ka5 10. Nc4+ dxc4 11. Bb6+ Kb5 12. Ba7+ Ka5 13. Bb8 Re6 14. Bc7+
Rb6 15. Rxb6 Qg1 (15... Qc6 16. Ra6+ Kb5 17. Ra5#) 16. Ra6+ Kb5 17. Ra5#) (1.
Ba7+ Ka5 2. Bb6+ (2. Bb8 $4 Rxb4 $1) 2... Kb5 3. Bd4+ Ka5 4. Nc4+ dxc4 5. Bb6+
Kb5 6. Bf2+ Ka5 7. Qxh4 Rxh4 8. Bb6+ Kb5 9. Ba7+ Ka5 10. Bb8 Qg1 11. Bc7+ Qb6
12. Rxb6 Re6 13. Rxe6+ Kb5 14. Re5#) (1. Bf2+ Ka5 2. Bb6+ Kb5 3. Bd4+ Ka5 4.
Nc4+ dxc4 5. Bb6+ Kb5 6. Bf2+ Ka5 7. Qxh4 Rxh4 8. Bb6+ Kb5 9. Ba7+ Ka5 10. Bb8
Qg1 11. Bc7+ Qb6 12. Rxb6 Re6 13. Rxe6+ Kb5 14. Re5#) 1... Ka5 2. Nc4+ dxc4 3.
Bb6+ Kb5 4. Bf2+ (4. Ba7+ $6 Ka5 5. Bb6+ (5. Bb8 $4 Ra2+ $1) 5... Kb5 6. Bf2+
Ka5 7. Qxh4 Rxh4 8. Bb6+ Kb5 9. Ba7+ Ka5 10. Bb8 Qg1 11. Bc7+ Qb6 12. Rxb6 Re6
13. Ra6+ Kb5 14. Ra5#) 4... Ka5 5. Qxh4 Rxh4 6. Bb6+ Kb5 7. Ba7+ Ka5 8. Bb8 Re6
9. Bc7+ Rb6 10. Rxb6 Qg1 11. Ra6+ Kb5 12. Ra5# 1-0

[Paloma]

Hi Franz,

the first one is mate in 16
[D]4br1n/b7/Kp6/pp1R4/2N2pBk/2Bp1Pp1/1n2p1P1/1r1q4 w - - 0 1

1. Ne5 e1=Q 2. Nf7 Qe5 3. Nxe5 Nc4 4. Nf7 Ne5 5. Nxe5 Ng6 6. Nf7 Ne5 7. Nxe5
Bb8 8. Nf7 Be5 9. Nxe5 Qe2 10. Nf7 Qe5 11. Nxe5 Re1 12. Nf7 Re5 13. Nxe5 Rf5
14. Nf7 Bc6 15. Bf6+ Rxf6 16. Rh5#

[Jouni]

This 12 mover was solved faster than Chest with all engines I tried - even with Rybka4! BTW any chance to made MP or 64b version about Chest?

Jouni

[Robert Flesher]

Well, unfortunately NOT!

Now we've found the correct postion (FEN above!), but when I tried to solve this #19 with ChestUCI's AutoTurbo mode, it even found a shorter solution: #17

ChestUCI Ver.5.2:
CPU: Celeron 400MHz
FEN: 4b3/1R2p3/1B6/1k1p4/pN2r1pp/Kpp2pnQ/1N5r/3B3q w - - (7+14)
Position-Analysis: C0/R0/K1/P10/X37 W:6/33
Parameters found in Clipboard: #17; 00:12 @ C2/R1/K2/P11/X35;
Search for Special-Mate [C2/R1/K2/P11/X35] in 17 ... (Hash=64MB)
17 00:12 437.351 98.281 +M17 1.Bg1+
Search completed ... (Time=12.30s)
Mate in 17 found ! (1 Solution in 00:12)
17/17 00:12 1.188.942 96.661 +M17 1.Bg1+ Ka5 2.Qf1 Nxf1 3.Bb6+ Kb5 4.Bf2+ Ka5 5.Ra7+ Kb5 6.Be2+ fxe2 7.Rb7+ Ka5 8.Bb6+ Kb5 9.Bd4+ Ka5 10.Nc4+ dxc4 11.Bb6+ Kb5 12.Ba7+ Ka5 13.Bb8 Re6 14.Bc7+ Rb6 15.Rxb6 Qg1 16.Ra6+ Kb5 17.Ra5+
Best move: Bg1, Value: +Mate in 17, Depth: 17/17, Time: 00:12,802, 1.188.942 Nodes, 96.661 N/sec

Sorry for you even more, Franz!

Now, that we found the correct postion, Zappa found an even shorter way even with another first move!



4b3/1R2p3/1B6/1k1p4/pN2r1pp/Kpp2pnQ/1N5r/3B3q w - - 0 1

1. Bd4+ Ka5 2. Nc4+ dxc4 3. Bb6+ Kb5 4. Bf2+ Ka5 5. Qxh4 Rxh4 6. Bb6+ Kb5 7.
Ba7+ Ka5 8. Bb8 Re6 9. Bc7+ Rb6 10. Rxb6 Qg1 11. Ra6+ Kb5 12. Ra5#

Confirmed!
New game
4b3/1R2p3/1B6/1k1p4/pN2r1pp/Kpp2pnQ/1N5r/3B3q w - - 0 1

Analysis by Critter 0.90 64-bit SSE4:

1.Bd4+ Ka5 2.Ra7+ Kb5
= (0.00) Depth: 2/5 00:00:00
1.Bd4+ Ka5 2.Ra7+ Kb5
= (0.00) Depth: 5/10 00:00:00
1.Bd4+ Ka5 2.Ra7+ Kb5
= (0.00) Depth: 5/10 00:00:00
1.Bd4+ Ka5 2.Ra7+ Kb5
= (0.00) Depth: 5/10 00:00:00
1.Bd4+ Ka5 2.Ra7+ Kb5
= (0.00) Depth: 6/11 00:00:00 2kN
1.Bd4+ Ka5 2.Ra7+ Kb5
= (0.00) Depth: 7/15 00:00:00 4kN
1.Bd4+ Ka5 2.Ra7+ Kb5
= (0.00) Depth: 8/17 00:00:00 13kN
1.Bd4+ Ka5 2.Ra7+ Kb5
= (0.00) Depth: 9/19 00:00:00 44kN
1.Bd4+ Ka5 2.Ra7+ Kb5
= (0.00) Depth: 10/21 00:00:00 97kN
1.Bd4+ Ka5 2.Ra7+ Kb5
= (0.00) Depth: 11/25 00:00:00 214kN
1.Bd4+ Ka5 2.Ra7+ Kb5
= (0.00) Depth: 12/25 00:00:00 418kN
1.Bd4+ Ka5 2.Ra7+ Kb5
= (0.00) Depth: 13/31 00:00:00 842kN
1.Bd4+ Ka5 2.Ra7+ Kb5
= (0.00) Depth: 14/32 00:00:00 1805kN
1.Bd4+ Ka5 2.Ra7+ Kb5
= (0.00) Depth: 15/32 00:00:00 4511kN
1.Bd4+ Ka5 2.Ra7+ Kb5
= (0.00) Depth: 16/33 00:00:01 9280kN
1.Bd4+ Ka5 2.Ra7+ Kb5
= (0.00) Depth: 17/36 00:00:01 17470kN
1.Bd4+ Ka5 2.Ra7+ Kb5
= (0.00) Depth: 18/40 00:00:04 46696kN
1.Bd4+ Ka5 2.Ra7+ Kb5
= (0.11) Depth: 19/42 00:00:10 100673kN
1.Bd4+ Ka5 2.Ra7+ Kb5
= (0.23) Depth: 19/42 00:00:10 100904kN
1.Bd4+ Ka5 2.Ra7+ Kb5
² (0.41) Depth: 19/42 00:00:10 101292kN
1.Bd4+ Ka5 2.Ra7+ Kb5
² (0.67) Depth: 19/44 00:00:10 103252kN
1.Bd4+ Ka5 2.Ra7+ Kb5
± (1.06) Depth: 19/44 00:00:10 106001kN
1.Bd4+ Ka5 2.Ra7+ Kb5
+- (1.64) Depth: 19/47 00:00:11 108741kN
1.Bd4+ Ka5 2.Ra7+ Kb5
+- (2.52) Depth: 19/47 00:00:11 113203kN
1.Bd4+ Ka5 2.Ra7+ Kb5
+- (3.84) Depth: 19/51 00:00:12 122059kN
1.Bd4+ Ka5 2.Ra7+ Kb5
+- (5.81) Depth: 19/54 00:00:14 137166kN
1.Bd4+ Ka5 2.Ra7+ Kb5
+- (8.77) Depth: 19/54 00:00:17 158984kN
1.Bd4+ Ka5 2.Ra7+ Kb5
+- (125.00) Depth: 19/56 00:00:22 206709kN
1.Bd4+ Ka5 2.Nc4+ dxc4 3.Bb6+ Kb5 4.Bf2+ Ka5 5.Qxh4 Rxh4 6.Bb6+ Kb5 7.Ba7+ Ka5 8.Bb8 Qg1 9.Bc7+ Qb6 10.Rxb6 Re6 11.Rxe6+ Kb5 12.Re5#
+- (#12) Depth: 19/56 00:00:24 224114kN
1.Bd4+ Ka5 2.Nc4+ dxc4 3.Bb6+ Kb5 4.Bf2+ Ka5 5.Qxh4 Rxh4 6.Bb6+ Kb5 7.Ba7+ Ka5 8.Bb8 Qg1 9.Bc7+ Qb6 10.Rxb6 Re6 11.Rxe6+ Kb5 12.Re5#
+- (#12) Depth: 20/56 00:00:33 322657kN
1.Bd4+ Ka5 2.Nc4+ dxc4 3.Bb6+ Kb5 4.Bf2+ Ka5 5.Qxh4 Rxh4 6.Bb6+ Kb5 7.Ba7+ Ka5 8.Bb8 Qg1 9.Bc7+ Qb6 10.Rxb6 Re6 11.Rxe6+ Kb5 12.Re5#
+- (#12) Depth: 21/56 00:00:50 492786kN
1.Bd4+ Ka5 2.Nc4+ dxc4 3.Bb6+ Kb5 4.Bf2+ Ka5 5.Qxh4 Rxh4 6.Bb6+ Kb5 7.Ba7+ Ka5 8.Bb8 Qg1 9.Bc7+ Qb6 10.Rxb6 Re6 11.Rxe6+ Kb5 12.Re5#
+- (#12) Depth: 22/56 00:01:18 794212kN

(, Microsoft 14.12.2010)


New game
4b3/1R2p3/1B6/1k1p4/pN2r1pp/Kpp2pnQ/1N5r/3B3q w - - 0 1

Analysis by Deep Rybka 4 SSE42 x64:

1.Be3+ Ka5 2.Bb6+ Kb5
= (0.00) Depth: 2 00:00:00
1.Be3+ Ka5 2.Bb6+ Kb5
= (0.00) Depth: 2 00:00:00
1.Be3+ Ka5 2.Bb6+ Kb5
= (0.00) Depth: 3 00:00:00
1.Be3+ Ka5 2.Bb6+ Kb5
= (0.00) Depth: 4 00:00:00
1.Be3+ Ka5 2.Bb6+ Kb5
= (0.00) Depth: 5 00:00:00
1.Be3+ Ka5 2.Bb6+ Kb5
= (0.00) Depth: 6 00:00:00 36kN
1.Be3+ Ka5 2.Bb6+ Kb5
= (0.00) Depth: 7 00:00:00 120kN
1.Be3+ Ka5 2.Bb6+ Kb5
= (0.00) Depth: 8 00:00:00 294kN
1.Be3+ Ka5 2.Bb6+ Kb5
= (0.00) Depth: 9 00:00:00 556kN
1.Be3+ Ka5 2.Bb6+ Kb5
= (0.00) Depth: 10 00:00:01 942kN
1.Be3+ Ka5 2.Bb6+ Kb5
= (0.00) Depth: 11 00:00:02 1870kN
1.Be3+ Ka5 2.Bb6+ Kb5
= (0.00) Depth: 12 00:00:05 3963kN
1.Bd4+ Ka5 2.Nc4+ dxc4 3.Bb6+ Kb5 4.Bf2+ Ka5 5.Qxh4 Rxf2 6.Qg5+ Nf5 7.Qxf5+ e5 8.Qxe4 Ra2+ 9.Nxa2 bxa2 10.Ra7+ Kb6 11.Qe3+ Kc6 12.Bxa4+ Kd6 13.Ra6+ Kd5 14.Ra5+ Bb5 15.Rxb5+ Ke6 16.Qxe5+
= (0.12) Depth: 12 00:00:08 6021kN
1.Bd4+ Ka5 2.Nc4+ dxc4 3.Bb6+ Kb5 4.Bf2+ Ka5 5.Qxh4 Rxf2 6.Qg5+ Nf5 7.Qxf5+ e5 8.Qxe4 Ra2+ 9.Nxa2 bxa2 10.Ra7+ Kb6 11.Qe3+ Kc6 12.Bxa4+ Kd6 13.Ra6+ Kd5 14.Ra5+ Bb5 15.Rxb5+ Ke6 16.Qxe5+
² (0.27) Depth: 12 00:00:08 6024kN
1.Bd4+ Ka5 2.Nc4+ dxc4 3.Bb6+ Kb5 4.Bf2+ Ka5 5.Qxh4 Rxf2 6.Qg5+ Nf5 7.Qxf5+ e5 8.Qxe4 Ra2+ 9.Nxa2 bxa2 10.Ra7+ Kb6 11.Qe3+ Kc6 12.Bxa4+ Kd6 13.Ra6+ Kd5 14.Ra5+ Bb5 15.Rxb5+ Ke6 16.Qxe5+
² (0.67) Depth: 12 00:00:08 6028kN
1.Bd4+ Ka5 2.Nc4+ dxc4 3.Bb6+ Kb5 4.Bf2+ Ka5 5.Qxh4 Rxf2 6.Qg5+ Nf5 7.Qxf5+ e5 8.Qxe4 Ra2+ 9.Nxa2 bxa2 10.Ra7+ Kb6 11.Qe3+ Kc6 12.Bxa4+ Kd6 13.Ra6+ Kd5 14.Ra5+ Bb5 15.Rxb5+ Ke6 16.Qxe5+
+- (1.47) Depth: 12 00:00:08 6034kN
1.Bd4+ Ka5 2.Nc4+ dxc4 3.Bb6+ Kb5 4.Bf2+ Ka5 5.Qxh4 Rxf2 6.Qg5+ Nf5 7.Qxf5+ e5 8.Qxe4 Ra2+ 9.Nxa2 bxa2 10.Ra7+ Kb6 11.Qe3+ Kc6 12.Bxa4+ Kd6 13.Ra6+ Kd5 14.Ra5+ Bb5 15.Rxb5+ Ke6 16.Qxe5+
+- (3.07) Depth: 12 00:00:08 6050kN
1.Bd4+ Ka5 2.Nc4+ dxc4 3.Bb6+ Kb5 4.Bf2+ Ka5 5.Qxh4 Rxf2 6.Qg5+ Nf5 7.Qxf5+ e5 8.Qxe4 Ra2+ 9.Nxa2 bxa2 10.Ra7+ Kb6 11.Qe3+ Kc6 12.Bxa4+ Kd6 13.Ra6+ Kd5 14.Ra5+ Bb5 15.Rxb5+ Ke6 16.Qxe5+
+- (6.27) Depth: 12 00:00:09 6280kN
1.Bd4+ Ka5 2.Nc4+ dxc4 3.Bb6+ Kb5 4.Bf2+ Ka5 5.Qxh4 Rxf2 6.Qg5+ Nf5 7.Qxf5+ e5 8.Qxe4 Ra2+ 9.Nxa2 bxa2 10.Ra7+ Kb6 11.Qe3+ Kc6 12.Bxa4+ Kd6 13.Ra6+ Kd5 14.Ra5+ Bb5 15.Rxb5+ Ke6 16.Qxe5+
+- (12.67) Depth: 12 00:00:09 6799kN
1.Bd4+ Ka5 2.Nc4+ dxc4 3.Bb6+ Kb5 4.Bf2+ Ka5 5.Qxh4 Rxf2 6.Qg5+ Nf5 7.Qxf5+ e5 8.Qxe4 Ra2+ 9.Nxa2 bxa2 10.Ra7+ Kb6 11.Qe3+ Kc6 12.Bxa4+ Kd6 13.Ra6+ Kd5 14.Ra5+ Bb5 15.Rxb5+ Ke6 16.Qxe5+
+- (25.47) Depth: 12 00:00:09 6840kN
1.Bd4+ Ka5 2.Nc4+ dxc4 3.Bb6+ Kb5 4.Bf2+ Ka5 5.Qxh4 Rxf2 6.Qg5+ Nf5 7.Qxf5+ e5 8.Qxe4 Ra2+ 9.Nxa2 bxa2 10.Ra7+ Kb6 11.Qe3+ Kc6 12.Bxa4+ Kd6 13.Ra6+ Kd5 14.Ra5+ Bb5 15.Rxb5+ Ke6 16.Qxe5+
+- (51.07) Depth: 12 00:00:09 6846kN
1.Bd4+ Ka5 2.Nc4+ dxc4 3.Bb6+ Kb5 4.Bf2+ Ka5 5.Qxh4 Rxh4 6.Bb6+ Kb5 7.Ba7+ Ka5 8.Bb8 Rh6 9.Bc7+ Rb6 10.Rxb6 Qh6 11.Rd6+ Kb5 12.Rd5#
+- (#12) Depth: 12 00:00:14 11093kN

(, Microsoft 14.12.2010)



New game
4b3/1R2p3/1B6/1k1p4/pN2r1pp/Kpp2pnQ/1N5r/3B3q w - - 0 1

Analysis by Houdini 1.03a x64 POPCNT 4_CPU:

1.Ba7+ Ka5 2.Bb6+ Kb5
= (0.00) Depth: 4/20 00:00:00
1.Ba7+ Ka5 2.Bb6+ Kb5
= (0.00) Depth: 7/20 00:00:00
1.Ba7+ Ka5 2.Bb6+ Kb5
= (0.00) Depth: 7/20 00:00:00 11kN
1.Ba7+ Ka5 2.Bb6+ Kb5
= (0.00) Depth: 7/20 00:00:00 11kN
1.Ba7+ Ka5 2.Bb6+ Kb5
= (0.00) Depth: 8/20 00:00:00 13kN
1.Ba7+ Ka5 2.Bb6+ Kb5
= (0.00) Depth: 9/20 00:00:00 16kN
1.Ba7+ Ka5 2.Bb6+ Kb5
= (0.00) Depth: 10/25 00:00:00 32kN
1.Ba7+ Ka5 2.Bb6+ Kb5
= (0.00) Depth: 11/38 00:00:00 125kN
1.Ba7+ Ka5 2.Bb6+ Kb5
= (0.00) Depth: 12/38 00:00:00 302kN
1.Ba7+ Ka5 2.Bb6+ Kb5
= (0.00) Depth: 13/38 00:00:00 830kN
1.Ba7+ Ka5 2.Bb6+ Kb5
= (0.00) Depth: 14/42 00:00:00 2302kN
1.Ba7+ Ka5 2.Bb6+ Kb5
= (0.00) Depth: 15/48 00:00:01 6388kN
1.Ba7+ Ka5 2.Bb6+ Kb5
= (0.00) Depth: 16/52 00:00:02 17029kN
1.Ba7+ Ka5 2.Bb6+ Kb5
= (0.00) Depth: 17/55 00:00:10 60921kN
1.Bd4+ Ka5 2.Ra7+ Kb5 3.Rb7+ Ka5
= (0.05) Depth: 17/59 00:00:18 108816kN
1.Bd4+ Ka5 2.Ra7+ Kb5 3.Rb7+ Ka5
= (0.17) Depth: 17/59 00:00:18 108906kN
1.Bd4+ Ka5 2.Ra7+ Kb5 3.Rb7+ Ka5
² (0.43) Depth: 17/59 00:00:18 109115kN
1.Bd4+ Ka5 2.Ra7+ Kb5 3.Rb7+ Ka5
± (1.38) Depth: 17/59 00:00:18 109699kN
1.Bd4+ Ka5 2.Ra7+ Kb5 3.Rb7+ Ka5
+- (4.99) Depth: 17/67 00:00:18 111140kN
1.Bd4+ Ka5 2.Nc4+ dxc4 3.Bb6+ Kb5 4.Bf2+ Ka5 5.Qxh4 Rxh4 6.Bb6+ Kb5 7.Ba7+ Ka5 8.Bb8 Qg1 9.Bc7+ Qb6 10.Rxb6
+- (14.50) Depth: 17/71 00:00:19 115759kN
1.Bd4+ Ka5 2.Nc4+ dxc4 3.Bb6+ Kb5 4.Bf2+ Ka5 5.Qxh4 Rxh4 6.Bb6+ Kb5 7.Ba7+ Ka5 8.Bb8 Qg1 9.Bc7+ Qb6 10.Rxb6 Rh6 11.Ra6+ Kb5 12.Ra5#
+- (#12) Depth: 17/71 00:00:19 117505kN
1.Bd4+ Ka5 2.Nc4+ dxc4 3.Bb6+ Kb5 4.Bf2+ Ka5 5.Qxh4 Rxh4 6.Bb6+ Kb5 7.Ba7+ Ka5 8.Bb8 Qg1 9.Bc7+ Qb6 10.Rxb6 Rh6 11.Ra6+ Kb5 12.Ra5#
+- (#12) Depth: 18/71 00:00:19 118091kN
1.Bd4+ Ka5 2.Nc4+ dxc4 3.Bb6+ Kb5 4.Bf2+ Ka5 5.Qxh4 Rxh4 6.Bb6+ Kb5 7.Ba7+ Ka5 8.Bb8 Qg1 9.Bc7+ Qb6 10.Rxb6 Rh6 11.Ra6+ Kb5 12.Ra5#
+- (#12) Depth: 19/71 00:00:20 122053kN
1.Bd4+ Ka5 2.Nc4+ dxc4 3.Bb6+ Kb5 4.Bf2+ Ka5 5.Qxh4 Rxh4 6.Bb6+ Kb5 7.Ba7+ Ka5 8.Bb8 Qg1 9.Bc7+ Qb6 10.Rxb6 Rh6 11.Ra6+ Kb5 12.Ra5#
+- (#12) Depth: 20/71 00:00:22 137418kN

(, Microsoft 14.12.2010)

[Ignacio]

Hi Franz,
Your first position:

FEN: 4br1n/b7/Kp6/pp1R4/2N2pBk/2Bp1Pp1/1n2p1P1/1r1q4 w - - 0 1

Chest 5.1:
FEN: 4br1n/b7/Kp6/pp1R4/2N2pBk/2Bp1Pp1/1n2p1P1/1r1q4 w - - (7+15)
Position-Analysis: C0/R0/K1/P11/X33 W:5/37
Parameters found in Clipboard: #16; 00:22 @ C0/R-3/K3/P12/X36;
Search for 1. Special-Mate [C0/R-3/K3/P12/X36] in 16 ... (Hash=2044MB)
16 00:25 7.729.390 459.644 +M16 Nc4e5
Search completed ... (Time=22.50s)
Mate in 16 found ! (1. Solution in 00:22)
16/16 00:27 10.543.045 468.683 +M16 Nc4e5 e2e1Q Ne5f7 Qe1e5 Nf7xe5 Nh8g6 Ne5f7 Ng6e5 Nf7xe5 Nb2c4 Ne5f7 Nc4e5 Nf7xe5 Ba7b8 Ne5f7 Bb8e5 Nf7xe5 Qd1e1 Ne5f7 Qe1e5 Nf7xe5 b5b4 Ne5f7 Be8b5+ Rd5xb5 Rf8a8+ Ka6b7 Ra8b8+ Kb7xb8 d3d2 Bc3f6+

Best,
Ignacio.

[F.Huber]

Thanks Herbert and Ignacio, it's good to have so many experts here!

I could also confirm this #16 with ChestUCI
4br1n/b7/Kp6/pp1R4/2N2pBk/2Bp1Pp1/1n2p1P1/1r1q4 w - - bm #16; 03:39+ @ C0/R-3/K3/P12/X36;
but with special parameters there's of course a (small) chance that there might exist a shorter solution.

[F.Huber]

BTW any chance to made MP or 64b version about Chest?

Sorry, (almost) no way!

[Ignacio]

Franz, your second position:

[FEN "n4b1n/3Q2NK/3B1r2/4P3/5RPp/1P1P2kb/ppppp2p/5r1q w - - 0 1"]

1. Nh5+ Kg2 2. Qb7+ Kg1 3. Qa7+ Kg2 4. Qxa8+ Kg1 5. Qa7+ Kg2 6. Qb7+ Kg1 7. Qb6+ Kg2 8. Qc6+ Kg1 9. Qc5+ Kg2 10. Qd5+ Kg1 11. Qd4+ Kg2 12. Qe4+ Kg1 13. Qe3+ Kg2 14. Qxe2+ Kg1 15. Qe3+ Kg2 16. Qxd2+ Kg1 17. Qe3+ Kg2 18. Qe4+ Kg1 19. Qd4+ Kg2 20. Qd5+ Kg1 21. Qc5+ Kg2 22. Qxc2+ Kg1 23. Qc5+ Kg2 24. Qd5+ Kg1 25. Qd4+ Kg2 26. Qxb2+ Kg1 27. Qd4+ Kg2 28. Qd5+ Kg1 29. Qc5+ Kg2 30. Qc6+ Kg1 31. Qb6+ Kg2 32. Qb7+ Kg1 33. Qa7+ Kg2 34. Qxa2+ Kg1 35. Qa7+ Kg2 36. Qb7+ Kg1 37. Qb6+ Kg2 38. Qc6+ Kg1 39. Bc5+ Bxc5 40. Qxc5+ Kg2 41. Qd5+ Kg1 42. Qd4+ Kg2 43. Qe4+ Kg1 44. Qe3+ Kg2 45. exf6 Nf7 46. Qe2+ Kg1 47. Rxf1+ Bxf1 48. Qe3+ Kg2 49. Nf4# 1-0

After 22... Kg1 I have get:

FEN: 5b1n/7K/3B1r2/4P2N/5RPp/1P1P3b/ppQ4p/5rkq w - - 1 23

Chest 5.1:
FEN: 5b1n/7K/3B1r2/4P2N/5RPp/1P1P3b/ppQ4p/5rkq w - - (9+11)
Position-Analysis: C0/R0/K1/P8/X38 W:9/42
Search for 1. Special-Mate [C0/R-4/K2/P5/X28] in 126 ... (Hash=2044MB)
27 05:06 117.417.973 669.761 +M27 Qc2c5+
Search completed ... (Time=301.74s)
Mate in 27 found ! (1. Solution in 05:01)
27/27 05:06 203.861.484 675.628 +M27 Qc2c5+ Kg1g2 Qc5d5+ Kg2g1 Qd5d4+ Kg1g2 Qd4xb2+ Kg2g1 Qb2d4+ Kg1g2 Qd4d5+ Kg2g1 Qd5c5+ Kg1g2 Qc5c6+ Kg2g1 Qc6b6+ Kg1g2 Qb6b7+ Kg2g1 Qb7a7+ Kg1g2 Qa7xa2+ Kg2g1 Qa2a7+ Kg1g2 Qa7b7+ Kg2g1 Qb7b6+ Kg1g2 Qb6c6+ Kg2g1 Bd6c5+ Bf8xc5 Qc6xc5+ Kg1g2 Qc5d5+ Kg2g1 Qd5d4+ Kg1g2 Qd4e4+ Kg2g1 Qe4e3+ Kg1g2 e5xf6 Nh8f7 Qe3e2+ Kg2g1 Rf4xf1+ Bh3xf1 Qe2e3+ Kg1g2 Nh5f4+

Regards,
Ignacio.