MESON Chess Problem Database

Problem Display
PID: 87937 (8/5Q1n/4pqP1/2B1N1p1/3KpkP1/7P/5NRp/3B1Rbr w - - 0 1)

Segers, Marcel

The Problemist, 1991

8/5Q1n/4pqP1/2B1N1p1/3KpkP1/7P/5NRp/3B1Rbr

#2

11 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bxf2+
      • 2.Rfxf2#
    • 1...Sf8
      • 2.Qxf6#
    • 1...e3
      • 2.Sd3#
  • Tries
    • 1.Kc4?
      • threat
        • 2.Sfd3#
      • 1...Kxe5
        • 2.Qc7#
      • 1...e3
        • 2.Sed3#
      • 1...Bxf2!
    • 1.Re1?
      • threat
        • 2.Rxe4#
      • 1...e3
        • 2.Sd3#
      • 1...Bxf2+!
    • 1.gxh7?
      • threat
        • 2.Qxf6#
      • 1...Bxf2+
        • 2.Rfxf2#
      • 1...Qf5
        • 2.Sg6#
      • 1...Qxf7!
    • 1.g7?
      • 1...Bxf2+
        • 2.Rfxf2#
      • 1...Qf5
        • 2.Sg6#
      • 1...Sf8
        • 2.Qxf6#
      • 1...e3
        • 2.Sd3#
      • 1...Qxf7!
  • Keys
    • 1.Bd6!
      • 1...Bxf2+
        • 2.Rfxf2#
      • 1...Qxf7
        • 2.Sd3#
      • 1...Qf5
        • 2.Sd3#
      • 1...Sf8
        • 2.Qxf6#
      • 1...e3
        • 2.Sd3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • B(a);CHECK,OGATE,P_PINS(I),P_SPINB(a),XS(C)::R(B),XB(a)
    • S(i);N_GUARD::QAR2(K),XQ(h)
    • P(d);N_PINS(C),P_PINS(I)::R(B)+S(C),DCHECK
  • Tries
    • Try
      • K(F);N_SPINS(C),P-FLIGHT
      • Threat
        • R(B)+S(C),DCHECK
      • Vars
        • K(e);N_SPINQ(h),OGATEB,S_FLIGHT,XS(I)::QAB(K)
        • P(d);N_GUARD::S(I)
      • Refutation
        • B(a);P_SPINB(a),XS(C)
    • Try
      • R(B);
      • Threat
        • R1(B),XP(d)
      • Vars
        • P(d);N_PINS(C),P_PINS(I)::S(C)
      • Refutation
        • B(a);CHECK,P_PINS(I),XS(C)
    • Try
      • P(J);XS(i)
      • Threat
        • QAR2(K),XQ(h)
      • Vars
        • B(a);CHECK,OGATE,P_PINS(I),P_SPINB(a),XS(C)::R(B),XB(a)
        • Q(h);::S(I)
      • Refutation
        • Q(h);N_SPINQ(h),XQ(K)
    • Try
      • P(J);
      • Vars
        • B(a);CHECK,OGATE,P_PINS(I),P_SPINB(a),XS(C)::R(B),XB(a)
        • Q(h);::S(I)
        • S(i);N_GUARD::QAR2(K),XQ(h)
        • P(d);N_PINS(C),P_PINS(I)::R(B)+S(C),DCHECK
      • Refutation
        • Q(h);N_SPINQ(h),XQ(K)
  • Actual
    • B(H);
    • Vars
      • B(a);CHECK,OGATE,P_PINS(I),P_SPINB(a),XS(C)::R(B),XB(a)
      • Q(h);N_SPINQ(h),XQ(K)::B(H)+S(I),DCHECK
      • Q(h);::B(H)+S(I),DCHECK
      • S(i);N_GUARD::QAR2(K),XQ(h)
      • P(d);N_PINS(C),P_PINS(I)::R(B)+S(C),DCHECK
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