# How many moves to checkmate in the initial position with all Black pieces captured?

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?

• you can easily just check stockfish analysis :/ Apr 8, 2022 at 0:28
• 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
• It is not possible to reach this position in 15 moves. Apr 8, 2022 at 10:19
• @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

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 #
``````
• OP says it is black to move. Apr 8, 2022 at 1:38
• @L.ScottJohnson: Oops, overlooked that. Doesn't change anything relevant except the n in n#, though :-) Apr 8, 2022 at 7:30