1N1K4/2R5/3ppP2/1P1kpb2/2n4P/2P1PPB1/2npp1NQ/4b3 w - - 0 1

# Find The Shortest Mate

I had a hard time with this one, though I shouldn't have. How will you do?

Comments

No. 1-10

Editor

The last line is the key one for 1.f7. 1.f7 Bg3 2.Nd7 e4, and I could never find a mate in 4, but only mate in 5.

Editor

After 1.Qh1 e4 then 2.Nf4 Ke5 3.Nd7#, so not in four, but in three which satisfies the puzzle's stipulation which is mate in no more than 4.

Will White MATE IN 4 when 1. Qh1, e4?

- f7! [threatening 2. Nd7, - ; 3. Nf6# (MATE IN 3!)]

a) if 1. …, N4b6; 2. Nd7,

.a1) 2. …, N:d7; 3. c4# (MATE IN 3!)

.a2) 2. …, - ; 3. Nf6# (MATE IN 3!)

b) if 1. …, N4a5; 2. c4+, N:c4; 3. Nd7, - ; 4. Nf6#

c) if 1. …, N4a3; 2. Nd7, N:b5; 3. c4#/Nf6# (MATE IN 3!)

d) if 1. …, N4:e3; 2. Nd7, Ng4; 3. Nb6# (MATE IN 3!)

e) if 1. …, N2b4; 2. Nd7, Nc6; 3. R:c6, - ; 4. Nf6#

f) if 1. …, N2d4; 2. Nd7, N:b5/N:f3; 3. Nf6# (MATE IN 3!)

g) if 1. …, N2:e3; 2. Nd7, Ng4; 3. Ne3+,

..g1) 3. …, Nc:e3; 4. Nb6#

..g2) 3. …, Ng:e3; 4. Nf6#

h) if 1. …, d1Q; 2. Nd7, - ; 3. Nf6# (MATE IN 3!)

i) if 1. …, e4; 2. Nf4+, Ke5 (forced); 3. Nd7 (MATE IN 3!)

j) if 1. …, B:g3; 2. Nd7, B:h4; 3. N:h4, - ; 4. Nf6#