MESON Chess Problem Database

Problem Display
PID: 242386 (K3b3/3Pk1B1/Q2R4/b1r3N1/8/8/8/8 w - - 0 1)

Morra, Juan Carlos

Schakend Nederland, 1965

K3b3/3Pk1B1/Q2R4/b1r3N1/8/8/8/8

#2

6 + 4

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rc7
      • 2.d8Q#
      • 2.d8B#
    • 1...Rc8+
      • 2.dxc8S#
    • 1...Be1
      • 2.d8Q#
      • 2.d8B#
    • 1...Bd2
      • 2.d8Q#
      • 2.d8B#
    • 1...Bc3
      • 2.d8Q#
      • 2.d8B#
    • 1...Bb4
      • 2.d8Q#
      • 2.d8B#
  • Tries
    • 1.Bf8+?
      • 1...Kd8
        • 2.Se6#
      • 1...Kxf8!
    • 1.Qa7?
      • threat
        • 2.d8Q#
      • 1...Rc8+
        • 2.dxc8S#
      • 1...Kd8
        • 2.Bf6#
      • 1...Bxd7
        • 2.Qxd7#
      • 1...Bd8
        • 2.Re6#
      • 1...Kxd6!
  • Keys
    • 1.Qb7!
      • threat
        • 2.d8Q#
      • 1...Rc8+
        • 2.dxc8S#
      • 1...Kxd6
        • 2.dxe8S#
      • 1...Kd8
        • 2.Bf6#
      • 1...Bxd7
        • 2.Qxd7#
      • 1...Bd8
        • 2.Re6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • R(b);S_CUTB(a)::P=Q
    • R(b);CHECK,OGATE::PXR(b)=S
    • B(a);N_GUARD::P=Q
  • Tries
    • Try
      • B(E);CHECK
      • Vars
        • K(c);S_FLIGHT::S(A)
      • Refutation
        • K(c);S_FLIGHT,XB(E)
    • Try
      • Q(B);
      • Threat
        • P=Q
      • Vars
        • R(b);CHECK,OGATE::PXR(b)=S
        • K(c);S_FLIGHT::B(E)
        • B(d);OGATE,P_SPINB(d),XP(D)::QAR1(B),XB(d)
        • B(a);SBLOCK::R1(C)
      • Refutation
        • K(c);S_FLIGHT,XR(C)
  • Actual
    • Q(B);
    • Threat
      • P=Q
    • Vars
      • R(b);CHECK,OGATE::PXR(b)=S
      • K(c);S_FLIGHT,XR(C)::PXB(d)=S
      • K(c);S_FLIGHT::B(E)
      • B(d);OGATE,P_SPINB(d),XP(D)::QAR1(B),XB(d)
      • B(a);SBLOCK::R1(C)
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