MESON Chess Problem Database

Problem Display
PID: 249107 (4R1N1/2P2p2/3r2p1/1R1p1kp1/6b1/1KN2P2/2P5/1BBq1Q2 w - - 0 1)

de Blasio, Francis JC

5th HM., Christian Science Monitor, 1952

(First published on Sat Mar 8 1952)

4R1N1/2P2p2/3r2p1/1R1p1kp1/6b1/1KN2P2/2P5/1BBq1Q2

#2

11 + 8

15601 Albrecht-Leiss-Degener Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc2+
      • 2.Bxc2#
    • 1...Qd3
      • 2.Qxd3#
    • 1...Rf6
      • 2.Sh6#
    • 1...f6
      • 2.Sh6#
  • Tries
    • 1.Sxd1?
      • threat
        • 2.Qd3#
        • 2.c3#
        • 2.c4#
      • 1...Bxf3
        • 2.Qxf3#
      • 1...Re6!
    • 1.Qxd1?
      • threat
        • 2.Qd3#
        • 2.fxg4#
      • 1...Bxf3
        • 2.Qxf3#
      • 1...Bh3
        • 2.Qd3#
      • 1...Bh5
        • 2.Qd3#
      • 1...Re6!
    • 1.c8Q+?
      • 1...Rd7
        • 2.Qxd7#
      • 1...Re6!
    • 1.c8B+?
      • 1...Rd7
        • 2.Bxd7#
      • 1...Re6!
  • Keys
    • 1.Sxd5!
      • threat
        • 2.Sh6#
      • 1...Qxc2+
        • 2.Bxc2#
      • 1...Qxf3+
        • 2.c3#
      • 1...Qd3+
        • 2.Qxd3#
      • 1...Qxd5+
        • 2.c4#
      • 1...Rxd5
        • 2.c8Q#
        • 2.c8B#
      • 1...Re6
        • 2.Sde7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • Q(a);CHECK,OGATE,P_SPINQ(a),XP(D)::B(A),XQ(a)
    • Q(a);N_GUARD,N_PINP(D),P_PINS(F)::QAB(C),XQ(a)
    • R(f);SBLOCK::S(K)
    • P(h);SBLOCK::S(K)
  • Tries
    • Try
      • S(F);N_SPINP(D),XQ(a)
      • Threat
        • DUALS(3)
      • Vars
        • B(b);OGATE,P_SPINB(b),XP(G)::QAR2(C),XB(b)
      • Refutation
        • R(f);
    • Try
      • Q(C);N_SPINP(D),XQ(a)
      • Threat
        • DUALS(2)
      • Vars
        • B(b);OGATE,XP(G)::QAR2(C),XB(b)
        • B(b);::QAB(C)
      • Refutation
        • R(f);
    • Try
      • P(I);CHECK
      • Vars
        • R(f);N_GUARD,P_SPINR(f)::QAB(I),XR(f)
      • Refutation
        • R(f);P_SPINR(f)
    • Try
      • P(I);CHECK
      • Vars
        • R(f);N_GUARD,P_SPINR(f)::B(I),XR(f)
      • Refutation
        • R(f);P_SPINR(f)
  • Actual
    • S(F);XP(c)
    • Threat
      • S(K)
    • Vars
      • Q(a);CHECK,OGATE,P_SPINQ(a),XP(D)::B(A),XQ(a)
      • Q(a);CHECK,N_PINP(D),P_SPINQ(a),XP(G)::B(A)+P(D)
      • Q(a);CHECK,N_GUARD,N_PINP(D)::QAB(C),XQ(a)
      • Q(a);CHECK,N_PINP(D),P_SPINQ(a),XS(F)::B(A)+P(D)
      • R(f);N_GUARD,P_SPINR(f),XS(F)::P=Q
      • R(f);SBLOCK::R(H)+S(F),DCHECK
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