How good is your calculation? (tactics)
Black to move. What is the minimum number of moves for black to checkmate the white king. Assume both sides play optimally. If a force mate is not possible, give your answer as
.
E. Colle vs. P.Johner (Carlsbad Tournament, 1929)
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
1 solution
If 2. Rxb2, ... Qe1+ 3. Rb1 Rxb1#
If 2. Kb1, ...Be5+
If 3. Kc1 or 3. Kc2, ... Qb1#
If 3. Rb2, ...Qe1+ 4. Kc2 Rxb2#
It takes 4 moves to checkmate the White King.