MESON Chess Problem Database

Problem Display
PID: 10109 (1b3Q2/2P2N2/1B2p1p1/1K3b1r/4P1P1/3N1kPR/5p1r/5B2 w - - 0 1)

Lipton, Michael

Correspondence Chess, 1962

1b3Q2/2P2N2/1B2p1p1/1K3b1r/4P1P1/3N1kPR/5p1r/5B2

#2

11 + 8

3174 The Two-move Chess Problem Tradition and Development 1966

SOLUTION

  • SOUND
  • Sets
    • 1...Kxg4
      • 2.Sde5#
    • 1...Bxe4+
      • 2.Sfe5#
    • 1...Bxg4+
      • 2.Sg5#
  • Tries
    • 1.Sxf2?
      • threat
        • 2.Se5#
        • 2.Qa3#
      • 1...Bxe4+
        • 2.Se5#
        • 2.Sg5#
      • 1...Bxg4+
        • 2.Se5#
        • 2.Sg5#
      • 1...R2xh3
        • 2.Qa3#
      • 1...R5xh3
        • 2.Qa3#
      • 1...Bxc7
        • 2.Qa3#
      • 1...e5
        • 2.Sxe5#
        • 2.Qa3#
      • 1...Rxf2!
  • Keys
    • 1.Qa3!
      • threat
        • 2.Sxf2#
      • 1...Bxe4+
        • 2.Sde5#
      • 1...Bxg4+
        • 2.Sc5#
      • 1...Kxe4
        • 2.Qa8#
      • 1...Kxg4
        • 2.Sde5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(c);S_FLIGHT,XP(F)::S(B)
    • B(d);CHECK,SBLOCK,XP(E)::QAR(K)+S(J),DCHECK
    • B(d);CHECK,SBLOCK,XP(F)::QAR(K)+S(J),DCHECK
  • Tries
    • Try
      • S(B);XP(a)
      • Threat
        • DUALS(2)
      • Vars
        • R(b);XR(D)::QAR(K)
        • R(e);XR(D)::QAR(K)
        • B(h);XP(I)::QAR(K)
      • Refutation
        • R(b);XS(B)
  • Actual
    • Q(K);
    • Threat
      • QAR(K)+S(B),XP(a)
    • Vars
      • B(d);CHECK,SBLOCK,XP(E)::QAR(K)+S(B),DCHECK
      • B(d);CHECK,SBLOCK,XP(F)::QAR(K)+S(B)
      • K(c);OGATEB,S_FLIGHT,XP(E)::QAB(K)
      • K(c);S_FLIGHT,XP(F)::S(B)
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