Can white win?

[Hobacle]

[fen]4n2n/5ppr/5prb/1N3Pp1/5pP1/5P2/3Pk1PP/4N1K1 w - - 0 1[/fen]

[peter]

Single horse mate race again?

[Hobacle]

Single horse mate race again?

Just a try. I don't know whether white mates. Actually none of my previous compositions in this theme is a mate only by one knight, even plus a king and some pawns.

[peter]

Single horse mate race again?

Just a try. I don't know whether white mates. Actually none of my previous compositions in this theme is a mate only by one knight, even plus a king and some pawns.

[fen]4k3/7K/8/8/p4ppp/4pprb/1NBprpn1/4bqnR w - - 0 1[/fen]
From June 21 in my database stored as one of yours, isn't it?
Well Bishop comes for assistance at the very end again, but it isn't the one I was thinking about seeing the new one anyhow, still looking for it.
Edit:
In meantime backward till 4th move with DTM- score (quite some too long, just for showing in edit- time).
After

4n2n/5ppr/5prb/1N3Pp1/5pP1/5P2/3Pk1PP/4N1K1 w - - 0 1

1. d4 Kxe1 2. d5 Ke2 3. d6 Nxd6 4. Nxd6 Kd3:

7n/5ppr/3N1prb/5Pp1/5pP1/3k1P2/6PP/6K1 w - -

Engine: SlowChess Blitz 2.9 avx20 (32768 MB)
von Jonathan Kreuzer

62/128 1:32 +M75 5.Kf2 Kd2 6.Se4+ Kd3 7.Ke1 Kc2 8.Ke2 Kc1
9.Sc3 Kc2 10.Sb5 Kb3 11.Kd3 Kb2
12.Sd4 Kb1 13.Kd2 Kb2 14.Se2 Kb3
15.Kc1 Kb4 16.Kb2 Kc4 17.Kc2 Kb4
18.Sc1 (2.470.810.328) 26645

[peter]

Edit:
In meantime backward till 4th move with DTM- score (quite some too long, just for showing in edit- time).
After

4n2n/5ppr/5prb/1N3Pp1/5pP1/5P2/3Pk1PP/4N1K1 w - - 0 1

1. d4 Kxe1 2. d5 Ke2 3. d6 Nxd6 4. Nxd6 Kd3:

7n/5ppr/3N1prb/5Pp1/5pP1/3k1P2/6PP/6K1 w - -

Engine: SlowChess Blitz 2.9 avx20 (32768 MB)
von Jonathan Kreuzer

62/128 1:32 +M75 5.Kf2 Kd2 6.Se4+ Kd3 7.Ke1 Kc2 8.Ke2 Kc1
9.Sc3 Kc2 10.Sb5 Kb3 11.Kd3 Kb2
12.Sd4 Kb1 13.Kd2 Kb2 14.Se2 Kb3
15.Kc1 Kb4 16.Kb2 Kc4 17.Kc2 Kb4
18.Sc1 (2.470.810.328) 26645

Edit- time over, getting too consuming anyhow, just one more output without DTM from starting position:


[fen]4n2n/5ppr/5prb/1N3Pp1/5pP1/5P2/3Pk1PP/4N1K1 w - -[/fen]

Engine: SlowChess Blitz 2.9 avx20 (32768 MB)
von Jonathan Kreuzer


49/122 0:30 +17.13 1.d3 Kxe1 2.d4 Kd2 3.d5 Ke2 4.d6 Sxd6
5.Sxd6 Ke1 6.Sc4 Ke2 7.Sa5 Ke1 8.Sb7 Ke2
9.Sc5 Ke1 10.h3 Ke2 11.Sb7 Ke1
12.Sa5 Ke2 13.Sb3 Ke1 14.Sd4 (837.720.209) 27529

h-pawn is necessary just in case Black doesn't let White's King out of g- field, then h3 has to give zugzwang together with Knight once in a while, regards

[Hobacle]

Edit:
In meantime backward till 4th move with DTM- score (quite some too long, just for showing in edit- time).
After

4n2n/5ppr/5prb/1N3Pp1/5pP1/5P2/3Pk1PP/4N1K1 w - - 0 1

1. d4 Kxe1 2. d5 Ke2 3. d6 Nxd6 4. Nxd6 Kd3:

7n/5ppr/3N1prb/5Pp1/5pP1/3k1P2/6PP/6K1 w - -

Engine: SlowChess Blitz 2.9 avx20 (32768 MB)
von Jonathan Kreuzer

62/128 1:32 +M75 5.Kf2 Kd2 6.Se4+ Kd3 7.Ke1 Kc2 8.Ke2 Kc1
9.Sc3 Kc2 10.Sb5 Kb3 11.Kd3 Kb2
12.Sd4 Kb1 13.Kd2 Kb2 14.Se2 Kb3
15.Kc1 Kb4 16.Kb2 Kc4 17.Kc2 Kb4
18.Sc1 (2.470.810.328) 26645

Edit- time over, getting too consuming anyhow, just one more output without DTM from starting position:


[fen]4n2n/5ppr/5prb/1N3Pp1/5pP1/5P2/3Pk1PP/4N1K1 w - -[/fen]

Engine: SlowChess Blitz 2.9 avx20 (32768 MB)
von Jonathan Kreuzer


49/122 0:30 +17.13 1.d3 Kxe1 2.d4 Kd2 3.d5 Ke2 4.d6 Sxd6
5.Sxd6 Ke1 6.Sc4 Ke2 7.Sa5 Ke1 8.Sb7 Ke2
9.Sc5 Ke1 10.h3 Ke2 11.Sb7 Ke1
12.Sa5 Ke2 13.Sb3 Ke1 14.Sd4 (837.720.209) 27529

h-pawn is necessary just in case Black doesn't let White's King out of g- field, then h3 has to give zugzwang togehter with Knight once in a while, regards

What I got earlier was this:

Code: Select all

4n2n/5ppr/5prb/1N3Pp1/5pP1/5P2/3Pk1PP/4N1K1 w - - 0 1

Analysis by Stockfish 151121:

1. +- (3.78): 1.d3 Kxe1 2.d4 Kd2 3.Kf2 Kc1 4.d5 Kb2 5.Kf1 Kb3 6.d6 Nxd6 7.Nxd6 Ka3 8.Ke1 Kb2 9.Kd1 Kb3 10.Kd2 Kb4 11.Kd3 Kc5 12.Ne4+ Kb4 13.Nd2 Kc5 14.Kc3 Kd5 15.Nb3 Kc6 16.Nd4+ Kc5 17.Ne2 Kd5 18.Kb4 Kc6 19.Nc3 Kb6 20.Kc4 Ka6 21.Ne4 Kb6 22.Nc5 
2. +/- (1.17): 1.d4 Kxe1 2.d5 Ke2 3.d6 Nxd6 4.Nxd6 Ke1 5.Nb5 Ke2 6.h3 Ke1 7.Nd4 Kd2 8.Kf2 Kc3 9.Nb5+ Kc4 10.Nd6+ Kd3 11.Kf1 Kc3 12.Ke2 Kd4 13.Kd2 Kc5 14.Ne4+ Kc4 15.Nf2 Kb5 16.Kd3 Kb4 17.Nd1 Kb5 18.Kc3 Kc6 19.Nf2 Kc7 20.Kb3 Kd6 21.Kc4 Kc6 22.Nd3 Kb6 23.Kb4 Kc6 24.Nb2 Kd6 25.Kc3 Kc7 26.Na4 Kd8 27.Kc4 Kc7 28.Kb4 Kc6 
3. +/- (1.17): 1.h3 Kxe1 2.d4 Ke2 3.d5 Ke1 4.d6 Nxd6 5.Nxd6 Ke2 6.Nb5 Ke1 7.Nd4 Kd2 8.Kf2 Kc3 9.Nb5+ Kc4 10.Nd6+ Kd3 11.Kf1 Kc3 12.Ke2 Kd4 13.Kd2 Kc5 14.Ne4+ Kc4 15.Nf2 Kb5 16.Kd3 Kb4 17.Nd1 Kb5 18.Kc3 Kc6 19.Nf2 Kc7 20.Kb3 Kd6 21.Kc4 Kc6 22.Nd3 Kb6 23.Kb4 Kc6 24.Nb2 Kd6 25.Kc3 Kc7 26.Na4 Kd8 27.Kc4 Kc7 28.Kb4 
4. +/- (1.17): 1.Nc2 Kxd2 2.Nb4 Ke1 3.Nd3+ Kd2 4.Nf2 Ke1 5.Ne4 Ke2 6.Ned6 Nxd6 7.Nxd6 Ke1 8.Nb5 Ke2 9.h3 Ke1 10.Nd4 Kd2 11.Kf2 Kc3 12.Nb5+ Kc4 13.Nd6+ Kd3 14.Kf1 Kc3 15.Ke2 Kd4 16.Kd2 Kc5 17.Ne4+ Kc4 18.Nf2 Kb5 19.Kd3 Kb4 20.Nd1 Kb5 21.Kc3 Kc6 22.Nf2 Kc7 23.Kb3 Kd6 24.Kc4 Kc6 25.Nd3 Kb6 26.Kb4 Kc6 27.Nb2 Kd6 28.Kc3 Kc7 29.Na4 Kd8 30.Kc4 
5. -+ (-10.50): 1.h4 Nc7 2.Nxc7 gxh4 3.fxg6 Nxg6 4.Nc2 Kxd2 5.Na3 Ne5 6.Nb1+ Kc2 7.Na3+ Kd3 8.Na6 h3 9.Nc5+ Kd4 10.Ne4 Bg5 11.Nf2 h2+ 12.Kh1 Ke3 13.Nd1+ Ke2 14.Nc3+ Kd3 15.Na4 g6 16.Nb5 Ke3 17.Nc5 Nxf3 18.gxf3 Kxf3 19.Nd4+ Kf2 20.Nc2 Rh8 21.Ne4+ Kf3 22.Nc3 Rh7 

What I want to see is only 1.d3 wins, 1.d4, 1.h3 and 1.Nc2 will draw by the 50-move rule(the use of h3 is only reseting the DTZ). Also I wonder whether the result of 1.d3 is a mate or a winning endgame.

[peter]

4n2n/5ppr/5prb/1N3Pp1/5pP1/5P2/3Pk1PP/4N1K1 w - - 0 1

Analysis by Stockfish 11 64 POPCNT:

1.d4 Kd1 2.d5 Ke2 3.Sd3 Kxd3 4.d6 Sxd6 5.Sxd6 Ke3 6.Sb5 Ke2 7.Sd4+ Kd1 8.Kf1 Kc1 9.Sb3+ Kb2 10.Sa5 Kc2 11.Kg1 Kd1 12.Kf2 Kc1 13.Sc6 Kd2 14.Kf1 Kc2 15.h3 Kb1 16.Kf2 Kb2 17.Ke2 Ka2 18.Kd1 Ka1 19.Kd2 Ka2 20.Kc3 Ka1 21.Sb4 Kb1 22.Sd3 Ka2 23.Sc5 Ka3 24.Se4 Ka4 25.Sf2 Kb5 26.Kd2 Kc6 27.Ke1 Kc7 28.Sd1 Kc8 29.Sb2 Kb8 30.Kd2 Kb7 31.Sd3 Kc7 32.Kc3 Kd6 33.Sb2 Kc6 34.Sc4 Kc7 35.Kd2 Kb7 36.Sd6+ Kb8 37.Ke1 Kc7 38.Sb5+ Kc8 39.Sd4 Kd7 40.Se2 Kc6 41.Sc3 Kd6
+- (147.92) Tiefe: 78/82 00:01:34 9582MN

After 1.d3:

4n2n/5ppr/5prb/1N3Pp1/5pP1/3P1P2/4k1PP/4N1K1 b - - 0 1

Analysis by Stockfish 11 64 POPCNT30:

1...Kd1 2.d4 Kc1 3.Sd3+ Kc2 4.Sc5 Kb2 5.d5 Kc2 6.Kf2 Kb2 7.Se4 Kb3 8.Sed6 Kb4 9.Sxe8 Kxb5 10.Sd6+ Kc5 11.Se4+ Kxd5 12.Kg1 Kd4 13.Kf1 Ke5 14.h3 Kd4 15.Sd2 Kc3 16.Ke2 Kb4 17.Kd1 Kc3 18.Se4+ Kc4 19.Sf2 Kd4 20.Kd2 Ke5 21.Sd3+ Kd5 22.Sb4+ Kc5 23.Sa2 Kd6 24.Sc3 Ke5 25.Sb5 Kd5 26.Ke2 Kc4 27.Sa3+ Kc5 28.Sb1 Kb4 29.Kd3 Ka5 30.Kc2 Kb4 31.Sd2 Kb5 32.Kc1 Ka4 33.Kd1 Kb5 34.Sb3 Ka4 35.Sc5+ Ka3 36.Ke1 Kb2 37.Sb7 Kc1 38.Sd8 Kc2 39.Kf1 Kd1 40.Sb7 Kc2 41.Sc5 Kb1 42.Ke2 Ka1 43.Sa6 Kb2 44.Kd2 Ka2 45.Sb4+ Kb3
+- (147.92) Tiefe: 80/89 00:00:57 5289MN

[Ajedrecista]

Hello:

Single horse mate race again?

Just a try. I don't know whether white mates. Actually none of my previous compositions in this theme is a mate only by one knight, even plus a king and some pawns.

If this is the case, then the only way I think is to drive the black king to f8 somehow, then black only moving ..., Kg8 and ..., Kf8 and white playing g3 to zugzwang black, allowing white to play Ke8 (cutting f8 square to the black king), letting the black pawn queening while the white knight manoeuvres to checkmate in e7. Something like this:

[pgn][Event ""]
[Site ""]
[Date ""]
[White ""]
[Black ""]
[SetUp "1"]
[FEN "2N2k1n/3K1ppr/5prb/5Pp1/5pP1/5P1P/6P1/8 w - - 0 1"]
[PlyCount "17"]
[Result "1-0"]

1. Nb6 Kg8 2. Kc8 (2. Kc7) Kf8 3. Kd8 Kg8 4. g3 Kf8 5. Nd7+ Kg8 6. Ke8 fxg3 7. Nb6 (7. Nb8 g2 8. Nc6) g2 8. Nc8 (8. Nd5) g1=Q 9. Ne7# 1-0[/pgn]

Is it possible to force trapping black king in f8 and g8 squares? Good question! Second question: the same as before, but without hitting the 50-move rule. Is it possible or would be a cursed win?

Regards from Spain.

Ajedrecista.

[Hobacle]

A possible line starting with 1.d4 :
[pgn][Event ""]
[Site ""]
[Date ""]
[Round ""]
[White ""]
[Black ""]
[Result "1/2-1/2"]
[FEN "4n2n/5ppr/5prb/1N3Pp1/5pP1/5P2/3Pk1PP/4N1K1 w - - 0 1"]
[SetUp "1"]

1. d4 Kxe1 2. d5 Ke2 3. d6 Nxd6 4. Nxd6 Ke1 5. Nb5 Ke2 6. h3 Ke1 7. Nd4 Kd1 8.
Kf1 Kd2 9. Kf2 Kd3 10. Nb5 Kd2 11. Nd6 Kd1 12. Ne4 Kc1 13. Ke1 Kc2 14. Ke2 Kc1
15. Nc3 Kc2 16. Nb5 Kb3 17. Kd3 Kb2 18. Kd2 Kb3 19. Nd6 Kb4 20. Kd3 Kb3 21. Nc4
Kb4 22. Nd2 Ka3 23. Kc2 Ka2 24. Nb3 Ka3 25. Nc1 Ka4 26. Kd3 Kb4 27. Kd4 Ka4 28.
Kc4 Ka3 29. Kc3 Ka4 30. Nd3 Ka5 31. Kc4 Ka4 32. Nb4 Ka5 33. Nc2 Ka4 34. Kc3 Ka5
35. Kd4 Kb5 36. Kd5 Ka5 37. Kc5 Ka4 38. Kc4 Ka5 39. Nd4 Ka6 40. Kc5 Ka5 41. Nb5
Ka6 42. Nc3 Ka5 43. Kc4 Ka6 44. Kd5 Kb6 45. Kd6 Ka6 46. Kc6 Ka5 47. Kc5 Ka6 48.
Nd5 Ka7 49. Nb6 Ka6 50. Nc4 Kb7 51. Kd6 Ka7 52. Kc7 Ka6 53. Kc6 Ka7 54. Nd6 Ka6
55. Nb7 Ka7 56. Nc5 {50} *
[/pgn]

[Hobacle]

Hello:

Single horse mate race again?

Just a try. I don't know whether white mates. Actually none of my previous compositions in this theme is a mate only by one knight, even plus a king and some pawns.

If this is the case, then the only way I think is to drive the black king to f8 somehow, then black only moving ..., Kg8 and ..., Kf8 and white playing g3 to zugzwang black, allowing white to play Ke8 (cutting f8 square to the black king), letting the black pawn queening while the white knight manoeuvres to checkmate in e7.

There's another way: to drive the black king to the a8 corner, then Kxh7 .