MESON Chess Problem Database

Problem Display
PID: 53292 (K2n2b1/n1PPk1PN/2r1PrP1/2P1RP2/2N5/B7/8/8 w - - 0 1)

Lider, Valentin Viktorovich

3rd Prize, Vecherni Moskva, 1977

K2n2b1/n1PPk1PN/2r1PrP1/2P1RP2/2N5/B7/8/8

#2

12 + 6

4393 Uralski Problemist 2004

SOLUTION

  • SOUND
  • Sets
    • 1...Rxc5
      • 2.Bxc5#
    • 1...Rb6
      • 2.cxb6#
    • 1...Rd6
      • 2.cxd6#
    • 1...Rcxe6
      • 2.c6#
    • 1...Rxc7
      • 2.c6#
    • 1...Rf8
      • 2.gxf8Q#
      • 2.gxf8B#
    • 1...Sxe6
      • 2.d8Q#
  • Keys
    • 1.Sb6!
      • threat
        • 2.Sd5#
      • 1...Rxc5
        • 2.Bxc5#
      • 1...Rxb6
        • 2.cxb6#
      • 1...Rcxe6
        • 2.c6#
      • 1...Rfxe6
        • 2.f6#
      • 1...Bxe6
        • 2.g8S#
      • 1...Sxe6
        • 2.d8Q#
      • 1...Rd6
        • 2.cxd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • R(a);OGATE,P_SPINR(a),XP(C)::B(A),XR(a)
    • R(a);OGATE::B(A)+P(C),XR(a)
    • R(a);OGATE::P(C),XR(a)
    • R(a);OGATE,P_SPINR(a),XP(F)::B(A)+P(C)
    • R(a);OGATE,XP(H)::B(A)+P(C)
    • R(b);OGATE::PXR(b)=Q
    • S(e);OGATE,P_SPINS(e),XP(F)::P=Q
  • Actual
    • S(B);
    • Threat
      • S(B)
    • Vars
      • R(a);OGATE,P_SPINR(a),XP(C)::B(A),XR(a)
      • R(a);OGATE,XS(B)::B(A)+P(C),XR(a)
      • R(a);OGATE,P_SPINR(a),XP(F)::B(A)+P(C)
      • R(b);OGATE,P_SPINR(b),XP(F)::P(E)
      • B(f);OGATE,P_SPINB(f),XP(F)::P=S
      • S(e);OGATE,P_SPINS(e),XP(F)::P=Q
      • R(a);OGATE::P(C),XR(a)
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