MESON Chess Problem Database

Problem Display
PID: 132718 (1Qr5/2prn3/2bP1k1P/K1N1qP2/6RP/4N3/BB6/8 w - - 0 1)

Rendall, JL

The Field, 1958

(First published on Thu Mar 20 1958)

1Qr5/2prn3/2bP1k1P/K1N1qP2/6RP/4N3/BB6/8

#2

11 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qxb2
      • 2.Qxb2#
    • 1...Qc3+
      • 2.Bxc3#
    • 1...Qd4
      • 2.Bxd4#
    • 1...Rf8
      • 2.Qxf8#
    • 1...Rh8
      • 2.Qxh8#
    • 1...Bb5
      • 2.Se4#
    • 1...Sg6
      • 2.Rxg6#
    • 1...Sg8
      • 2.Rg6#
  • Keys
    • 1.Rg7!
      • threat
        • 2.Rf7#
      • 1...Qc3+
        • 2.Bxc3#
      • 1...Qxb2
        • 2.Qxb2#
      • 1...Sxf5
        • 2.Sg4#
      • 1...Qd4
        • 2.Bxd4#
      • 1...Rf8
        • 2.Qxf8#
      • 1...Bd5
        • 2.Sxd7#
      • 1...Sd5
        • 2.Se4#
      • 1...Sg6
        • 2.Rxg6#
      • 1...Sg8
        • 2.Rg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • Q(a);N_PINS(G),N_SPINQ(a),OGATE,XB(B)::QAB(K),XQ(a)
    • Q(a);CHECK,N_PINS(G),OGATEB::B(B),XQ(a)
    • Q(a);N_PINS(G),OGATEB::B(B),XQ(a)
    • R(g);OGATE::QAR2(K),XR(g)
    • R(g);OGATE::QAB(K),XR(g)
    • B(b);N_PINS(G)::S(G)
    • S(f);N_GUARD::R1(D),XS(f)
    • S(f);N_GUARD::R1(D)
  • Actual
    • R(D);
    • Threat
      • R1(D)
    • Vars
      • Q(a);CHECK,N_PINS(G),OGATEB::B(B),XQ(a)
      • Q(a);N_PINS(G),N_SPINQ(a),OGATE,XB(B)::QAB(K),XQ(a)
      • S(f);SBLOCK,XP(H)::S(C)
      • Q(a);N_PINS(G),OGATEB::B(B),XQ(a)
      • R(g);OGATE::QAR2(K),XR(g)
      • B(b);N_PINS(G)::S(G),XR(e)
      • S(f);N_PINS(G)::S(G)
      • S(f);N_GUARD::R1(D),XS(f)
      • S(f);N_GUARD::R1(D)
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