-5

enter image description here

From the above position, black player lost (by mistakes) all of its pieces after his 15th move. How many more moves shall the black king have before it is checkmated by white if it is black' move?

5
  • 2
    you can easily just check stockfish analysis :/
    – DialFrost
    Apr 8, 2022 at 0:28
  • 1
    Stockfish gives mate in 7: "1... Kf7 2. e4 Ke6 3. d4 Kf7 4. Qh5+ Ke6 5. Qh7 Kd6 6. Bf4+ Ke6 7. d5+ Kf6 8. e5#" Apr 8, 2022 at 1:37
  • 2
    It is not possible to reach this position in 15 moves.
    – Étienne
    Apr 8, 2022 at 10:19
  • 1
    @Étienne OP probably conflated "had 15 pieces captured" with 15 moves. Apr 8, 2022 at 11:41
  • @Étienne-there are lines that this position was reached. Its black's 16th move
    – TSLF
    Apr 8, 2022 at 16:24

1 Answer 1

1

It's a mate in 6. (EDIT: I was reminded Black is to move, but it is still #6 on any defense, if I checked correctly.) Stockfish can tell you, and any problem chess program can tell you exactly. For the lulz, here is the complete output of "Popeye" with the threat (White to move). tl;dr: Only 1.e4 mates in 6, which I remembered correctly, since this is a well-known chess problem.

   1.e2-e4 ! threat:
      2.Qd1-g4 threat:
              3.Qg4-g7 threat:
                      4.Bf1-b5 +
                          4...Ke8-d8
                              5.Qg7-d7 #
                  3...Ke8-d8
                      4.Bf1-a6 zugzwang.
                          4...Kd8-e8
                              5.Ba6-b5 +
                                  5...Ke8-d8
                                      6.Qg7-d7 #
                              5.Ba6-c8 zugzwang.
                                  5...Ke8-d8
                                      6.Qg7-d7 #
                      4.Bf1-b5 threat:
                              5.Qg7-d7 #
                          4...Kd8-c8
                              5.Bb5-c6 zugzwang.
                                  5...Kc8-b8
                                      6.Qg7-b7 #
                                  5...Kc8-d8
                                      6.Qg7-d7 #
                              5.Qg7-a7 zugzwang.
                                  5...Kc8-d8
                                      6.Qa7-d7 #
          2...Ke8-f7
              3.Qg4-d7 +
                  3...Kf7-g6
                      4.d2-d4 threat:
                              5.Qd7-e7 zugzwang.
                                  5...Kg6-h5
                                      6.Qe7-g5 #
                          4...Kg6-h5
                              5.Bf1-c4 zugzwang.
                                  5...Kh5-g6
                                      6.Qd7-f7 #
                                  5...Kh5-h4
                                      6.Qd7-h3 #
                              5.Qd7-f5 +
                                  5...Kh5-h4
                                      6.Qf5-h3 #
                                      6.Qf5-g5 #
                                      6.g2-g3 #
                                      6.Sg1-f3 #
                              5.Qd7-e6 zugzwang.
                                  5...Kh5-h4
                                      6.Qe6-h3 #
                              5.Qd7-h7 +
                                  5...Kh5-g4
                                      6.Qh7-h3 #
                                      6.h2-h3 #
                                      6.f2-f3 #
                                      6.Bf1-e2 #
                              5.Qd7-g7 threat:
                                      6.Qg7-g5 #
                          4...Kg6-f6
                              5.Bf1-c4 threat:
                                      6.Qd7-f7 #
                  3...Kf7-g8
                      4.b2-b4 threat:
                              5.Bf1-c4 +
                                  5...Kg8-f8
                                      6.Qd7-f7 #
                                  5...Kg8-h8
                                      6.Bc1-b2 #
                          4...Kg8-f8
                              5.Bc1-b2 zugzwang.
                                  5...Kf8-g8
                                      6.Qd7-g7 #
                          4...Kg8-h8
                              5.Bc1-b2 +
                                  5...Kh8-g8
                                      6.Qd7-g7 #
                      4.b2-b3 threat:
                              5.Bf1-c4 +
                                  5...Kg8-f8
                                      6.Qd7-f7 #
                                      6.Bc1-a3 #
                                  5...Kg8-h8
                                      6.Bc1-b2 #
                          4...Kg8-f8
                              5.Bc1-b2 zugzwang.
                                  5...Kf8-g8
                                      6.Qd7-g7 #
                          4...Kg8-h8
                              5.Bc1-b2 +
                                  5...Kh8-g8
                                      6.Qd7-g7 #
                      4.d2-d4 threat:
                              5.Bc1-h6 threat:
                                      6.Qd7-g7 #
                      4.d2-d3 threat:
                              5.Bc1-h6 threat:
                                      6.Qd7-g7 #
                  3...Kf7-f6
                      4.d2-d4 threat:
                              5.Bf1-c4 threat:
                                      6.Qd7-f7 #
                          4...Kf6-g6
                              5.Qd7-e7 zugzwang.
                                  5...Kg6-h5
                                      6.Qe7-g5 #
                      4.d2-d3 zugzwang.
                          4...Kf6-e5
                              5.Qd7-c6 threat:
                                      6.Sg1-f3 #
                              5.Qd7-e7 +
                                  5...Ke5-d4
                                      6.Qe7-d6 #
                                      6.c2-c3 #
                                      6.Sg1-f3 #
                                      6.Sg1-e2 #
                                      6.Bc1-e3 #
                          4...Kf6-g6
                              5.Qd7-e7 zugzwang.
                                  5...Kg6-h5
                                      6.Qe7-g5 #
                  3...Kf7-f8
                      4.Sg1-h3 zugzwang.
                          4...Kf8-g8
                              5.Sh3-g5 zugzwang.
                                  5...Kg8-f8
                                      6.Qd7-f7 #
                                  5...Kg8-h8
                                      6.Qd7-h7 #
                      4.Sg1-f3 zugzwang.
                          4...Kf8-g8
                              5.Sf3-g5 zugzwang.
                                  5...Kg8-f8
                                      6.Qd7-f7 #
                                  5...Kg8-h8
                                      6.Qd7-h7 #
                      4.b2-b4 threat:
                              5.Bc1-b2 zugzwang.
                                  5...Kf8-g8
                                      6.Qd7-g7 #
                          4...Kf8-g8
                              5.Bf1-c4 +
                                  5...Kg8-f8
                                      6.Qd7-f7 #
                                  5...Kg8-h8
                                      6.Bc1-b2 #
                      4.b2-b3 threat:
                              5.Bc1-b2 zugzwang.
                                  5...Kf8-g8
                                      6.Qd7-g7 #
                          4...Kf8-g8
                              5.Bf1-c4 +
                                  5...Kg8-f8
                                      6.Qd7-f7 #
                                      6.Bc1-a3 #
                                  5...Kg8-h8
                                      6.Bc1-b2 #
                      4.d2-d4 threat:
                              5.Bc1-h6 +
                                  5...Kf8-g8
                                      6.Qd7-g7 #
                      4.d2-d3 threat:
                              5.Bc1-h6 +
                                  5...Kf8-g8
                                      6.Qd7-g7 #
          2...Ke8-f8
              3.Bf1-b5 zugzwang.
                  3...Kf8-e7
                      4.Qg4-g6 zugzwang.
                          4...Ke7-f8
                              5.e4-e5 zugzwang.
                                  5...Kf8-e7
                                      6.Qg6-e8 #
                                      6.Qg6-f6 #
                          4...Ke7-d8
                              5.Qg6-d6 +
                                  5...Kd8-c8
                                      6.Bb5-a6 #
                  3...Kf8-f7
                      4.e4-e5 zugzwang.
                          4...Kf7-e7
                              5.Qg4-f5 threat:
                                      6.Qf5-f6 #
                                  5...Ke7-d8
                                      6.Qf5-d7 #
                          4...Kf7-f8
                              5.Qg4-g6 zugzwang.
                                  5...Kf8-e7
                                      6.Qg6-e8 #
                                      6.Qg6-f6 #
              3.Qg4-d7 threat:
                      4.Sg1-h3 zugzwang.
                          4...Kf8-g8
                              5.Sh3-g5 zugzwang.
                                  5...Kg8-f8
                                      6.Qd7-f7 #
                                  5...Kg8-h8
                                      6.Qd7-h7 #
                      4.Sg1-f3 zugzwang.
                          4...Kf8-g8
                              5.Sf3-g5 zugzwang.
                                  5...Kg8-f8
                                      6.Qd7-f7 #
                                  5...Kg8-h8
                                      6.Qd7-h7 #
                      4.b2-b4 threat:
                              5.Bc1-b2 zugzwang.
                                  5...Kf8-g8
                                      6.Qd7-g7 #
                          4...Kf8-g8
                              5.Bf1-c4 +
                                  5...Kg8-f8
                                      6.Qd7-f7 #
                                  5...Kg8-h8
                                      6.Bc1-b2 #
                      4.b2-b3 threat:
                              5.Bc1-b2 zugzwang.
                                  5...Kf8-g8
                                      6.Qd7-g7 #
                          4...Kf8-g8
                              5.Bf1-c4 +
                                  5...Kg8-f8
                                      6.Qd7-f7 #
                                      6.Bc1-a3 #
                                  5...Kg8-h8
                                      6.Bc1-b2 #
                      4.d2-d4 threat:
                              5.Bc1-h6 +
                                  5...Kf8-g8
                                      6.Qd7-g7 #
                      4.d2-d3 threat:
                              5.Bc1-h6 +
                                  5...Kf8-g8
                                      6.Qd7-g7 #
                  3...Kf8-g8
                      4.b2-b4 threat:
                              5.Bf1-c4 +
                                  5...Kg8-f8
                                      6.Qd7-f7 #
                                  5...Kg8-h8
                                      6.Bc1-b2 #
                          4...Kg8-f8
                              5.Bc1-b2 zugzwang.
                                  5...Kf8-g8
                                      6.Qd7-g7 #
                          4...Kg8-h8
                              5.Bc1-b2 +
                                  5...Kh8-g8
                                      6.Qd7-g7 #
                      4.b2-b3 threat:
                              5.Bf1-c4 +
                                  5...Kg8-f8
                                      6.Qd7-f7 #
                                      6.Bc1-a3 #
                                  5...Kg8-h8
                                      6.Bc1-b2 #
                          4...Kg8-f8
                              5.Bc1-b2 zugzwang.
                                  5...Kf8-g8
                                      6.Qd7-g7 #
                          4...Kg8-h8
                              5.Bc1-b2 +
                                  5...Kh8-g8
                                      6.Qd7-g7 #
                      4.d2-d4 threat:
                              5.Bc1-h6 threat:
                                      6.Qd7-g7 #
                      4.d2-d3 threat:
                              5.Bc1-h6 threat:
                                      6.Qd7-g7 #
              3.Qg4-e6 threat:
                      4.Bf1-c4 threat:
                              5.Qe6-f7 #
                          4...Kf8-g7
                              5.d2-d4 threat:
                                      6.Qe6-h6 #
                                  5...Kg7-f8
                                      6.Qe6-f7 #
                                      6.Bc1-h6 #
                              5.d2-d3 threat:
                                      6.Qe6-h6 #
                                  5...Kg7-f8
                                      6.Qe6-f7 #
                                      6.Bc1-h6 #
                              5.Qe6-f7 +
                                  5...Kg7-h6
                                      6.d2-d4 #
                                      6.d2-d3 #
                                  5...Kg7-h8
                                      6.Qf7-g8 #
                      4.d2-d4 threat:
                              5.Bc1-h6 #
                          4...Kf8-g7
                              5.Bf1-c4 threat:
                                      6.Qe6-h6 #
                                  5...Kg7-f8
                                      6.Qe6-f7 #
                                      6.Bc1-h6 #
              3.Qg4-g6 zugzwang.
                  3...Kf8-e7
                      4.Bf1-b5 zugzwang.
                          4...Ke7-f8
                              5.e4-e5 zugzwang.
                                  5...Kf8-e7
                                      6.Qg6-e8 #
                                      6.Qg6-f6 #
                          4...Ke7-d8
                              5.Qg6-d6 +
                                  5...Kd8-c8
                                      6.Bb5-a6 #
2
  • 1
    OP says it is black to move. Apr 8, 2022 at 1:38
  • 2
    @L.ScottJohnson: Oops, overlooked that. Doesn't change anything relevant except the n in n#, though :-) Apr 8, 2022 at 7:30

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.