MESON Chess Problem Database

Problem Display
PID: 11779 (6rR/2PK1kp1/R7/3N1pr1/4pP2/B1Q1P2N/B5q1/b7 w - - 0 1)

Macleod, Norman Alasdair

1st Prize, BCF 131. Ty., 1972-1973

6rR/2PK1kp1/R7/3N1pr1/4pP2/B1Q1P2N/B5q1/b7

#2

11 + 8

259 Thema Danicum 1977
3753 FIDE Album (1971-1973) 1978
102 Probleemblad 1979
721 Variantim 1991
721 Variantim 1992
4640 Chess Wizardry: The New ABC of Chess Problems 1996
6455 The Chessboard Adventures of Norman Macleod 1996
3389 Belgian Solving Championship 2010

SOLUTION

  • SOUND
  • Sets
    • 1...Qf1
      • 2.Sxg5#
    • 1...Qh1
      • 2.Sxg5#
    • 1...Qf3
      • 2.Sxg5#
    • 1...Qxa2
      • 2.Sxg5#
    • 1...Qb2
      • 2.Sxg5#
    • 1...Qc2
      • 2.Sxg5#
    • 1...Qd2
      • 2.Sxg5#
    • 1...Qe2
      • 2.Sxg5#
    • 1...Qf2
      • 2.Sxg5#
    • 1...Qh2
      • 2.Sxg5#
    • 1...Rd8+
      • 2.cxd8S#
    • 1...Rf8
      • 2.Rxf8#
  • Tries
    • 1.Sb4+?
      • 1...Kf8
        • 2.Sc2#
        • 2.Sd3#
        • 2.Sc6#
        • 2.Ra8#
        • 2.Rxg8#
        • 2.Qc5#
        • 2.c8Q#
        • 2.c8R#
      • 1...Qxa2!
    • 1.Sb6+?
      • 1...Kg6
        • 2.Sa4#
        • 2.Sa8#
        • 2.Sc8#
      • 1...Qxa2!
    • 1.Sf6+?
      • 1...Kg6
        • 2.Sxe4#
        • 2.Sg4#
        • 2.Sh5#
        • 2.Se8#
        • 2.Sxg8#
      • 1...Qxa2!
    • 1.Se7+?
      • 1...Kf8
        • 2.Sxf5#
        • 2.Sc6#
        • 2.Sg6#
        • 2.Sc8#
        • 2.Sxg8#
        • 2.Ra8#
        • 2.Rxg8#
        • 2.c8Q#
        • 2.c8R#
      • 1...Qxa2!
    • 1.Qe5?
      • threat
        • 2.Qe6#
        • 2.Qe7#
      • 1...Rd8+
        • 2.cxd8S#
      • 1...Rxh8
        • 2.Qe6#
      • 1...Rg6
        • 2.Qe7#
      • 1...Re8
        • 2.Qxe8#
      • 1...g6
        • 2.Qe7#
      • 1...Bxe5!
  • Keys
    • 1.Qb2!
      • threat
        • 2.Sc3#
      • 1...Rd8+
        • 2.cxd8S#
      • 1...Qxb2
        • 2.Sxg5#
      • 1...Qf1
        • 2.Sxg5#
      • 1...Qc2
        • 2.Sxg5#
      • 1...Qd2
        • 2.Sxg5#
      • 1...Qe2
        • 2.Sxg5#
      • 1...Rg6
        • 2.Sf6#
      • 1...Rb8
        • 2.Sb4#
      • 1...Re8
        • 2.Se7#
      • 1...g6
        • 2.Sb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 6
  • Sets
    • Q(b);N_GUARD::S(E),XR(e)
    • Q(b);N_GUARD,XB(A)::S(E),XR(e)
    • Q(b);N_GUARD,P_PINS(G)::S(E),XR(e)
    • R(h);CHECK,OGATE::PXR(h)=S
    • R(h);OGATE::R1(K),XR(h)
  • Tries
    • Try
      • S(G);CHECK
      • Refutation
        • Q(b);XB(A)
    • Try
      • S(G);CHECK
      • Refutation
        • Q(b);XB(A)
    • Try
      • S(G);CHECK
      • Refutation
        • Q(b);XB(A)
    • Try
      • S(G);CHECK
      • Refutation
        • Q(b);XB(A)
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • R(h);CHECK,OGATE::PXR(h)=S
        • R(h);XR(K)::QAB1(C)
        • R(e);::QAR1(C)
        • R(h);N_GUARD::QAB1(C),XR(h)
        • P(g);::QAR1(C)
      • Refutation
        • B(a);XQ(C)
  • Actual
    • Q(C);
    • Threat
      • B(A)+S(G)
    • Vars
      • R(h);CHECK,OGATE::PXR(h)=S
      • Q(b);N_GUARD,XQ(C)::S(E),XR(e)
      • Q(b);N_GUARD::S(E),XR(e)
      • Q(b);N_GUARD,P_PINS(G)::S(E),XR(e)
      • R(e);SBLOCK::B(A)+S(G)
      • R(h);::B(A)+S(G)
      • P(g);SBLOCK::B(A)+S(G)
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