MESON Chess Problem Database

Problem Display
PID: 10892 (4b3/2QNP2n/3Bk1BR/8/8/4K3/8/8 w - - 0 1)

Haring, Jacobus

3rd Prize, Revista de Sah, 1969

4b3/2QNP2n/3Bk1BR/8/8/4K3/8/8

#2

7 + 3

3310 2345 Chess Problems 1997

SOLUTION

  • SOUND
  • Sets
    • 1...Kd5
      • 2.Be4#
  • Tries
    • 1.Ba3?
      • threat
        • 2.Qd6#
        • 2.Qc6#
      • 1...Kd5
        • 2.Be4#
      • 1...Bxd7
        • 2.Qd6#
      • 1...Bxg6!
    • 1.Bb4?
      • threat
        • 2.Qd6#
        • 2.Qc6#
      • 1...Kd5
        • 2.Be4#
      • 1...Bxd7
        • 2.Qd6#
      • 1...Bxg6!
    • 1.Be4+?
      • 1...Bg6
        • 2.e8Q#
      • 1...Sf6
        • 2.Rxf6#
      • 1...Kf7!
    • 1.Qc4+?
      • 1...Kxd7
        • 2.Bf5#
      • 1...Kxd6!
  • Keys
    • 1.Qc5!
      • 1...Kxd7
        • 2.Bf5#
      • 1...Bxg6
        • 2.e8Q#
      • 1...Bxd7
        • 2.Qe5#
      • 1...Bf7
        • 2.Bf5#
      • 1...Sg5
        • 2.Bxe8#
      • 1...Sf6
        • 2.Sf8#
      • 1...Sf8
        • 2.exf8S#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 1
  • Sets
    • K(a);S_FLIGHT::B(C)
  • Tries
    • Try
      • B(B);
      • Threat
        • DUALS(2)
      • Vars
        • K(a);S_FLIGHT::B(C)
        • B(c);XS(F)::QAR1(E)
      • Refutation
        • B(c);P_SPINB(c),XB(C)
    • Try
      • B(B);
      • Threat
        • DUALS(2)
      • Vars
        • K(a);S_FLIGHT::B(C)
        • B(c);XS(F)::QAR1(E)
      • Refutation
        • B(c);P_SPINB(c),XB(C)
    • Try
      • B(C);CHECK
      • Vars
        • B(c);OGATE,P_SPINB(c)::P=Q
        • S(b);N_GUARD,P_SPINS(b)::R1(D),XS(b)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);S_FLIGHT,XS(F)::B(C)
      • Refutation
        • K(a);P-FLIGHT,XB(B)
  • Actual
    • Q(E);
    • Vars
      • K(a);S_FLIGHT,XS(F)::B(C)
      • B(c);OGATE,P_SPINB(c),XB(C)::P=Q
      • B(c);SBLOCK,XS(F)::QAR1(E)
      • B(c);SBLOCK::R(D)+B(C),DCHECK
      • S(b);N_GUARD::R(D)+B(C),XB(c)
      • S(b);N_GUARD,SBLOCK::S(F)
      • S(b);OGATE::PXS(b)=S
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