Originally posted by BigDoggProblem
What is this site coming to when a guy can't even keep control of a hijacked thread.
Anyway, this was buried in a thread about engine users.
Challenge: construct a legal position where [b]A)White is attacking NONE of black's 16 pieces; but after he moves, he is B) attacking ALL of Black's 16 pieces.
"Attack" means "threaten to legally capture".
Originally posted by DeepThoughtAhh yes, I did leave this possibility open.
[fen]3bQ3/4pppp/p1n2k1B/1p1r2N1/PNppP1n1/1PPq3b/r3BKPP/R2Q1R2 w KQkq - 0 1[/fen]
After Kg1 or Ke1 every black piece is threatened. The position is legal if implausible.
Originally posted by Data FlyForgot about that, it was a fairly natural thing to wish to modify my original position rather than start from scratch. The problem is I'd have to.
Unfortunately this doesn't quite comply with part A - "White is attacking NONE of black's 16 pieces". In fact 15 of Black's 16 pieces are under attack in the initial position!
Originally posted by Data FlyVery good. That matrix is so good that I can get rid of two white units.
Let's go for Nd5 instead then.
[FEN "5B2/1b2N1R1/1r1p1qP1/4p1p1/1r1p1p1p/2n1kN2/3p3p/4n1bK w - - 0 1"]
. k . q . B . .
r b . . N R . .
. . . p . P . .
n . . . p . p .
. r . p . p . p
. . . . . N . .
. . . p . . . p
. . . . n . b K
white to play
Originally posted by BigDoggProblemUnfortunately this doesn't quite comply with part A - "White is attacking NONE of black's 16 pieces".
[b]Very good. That matrix is so good that I can get rid of two white units.