MESON Chess Problem Database

Problem Display
PID: 200036 (1b6/1K2p3/1p1pk2N/4rR2/B7/2N1p3/2Q1P3/8 w - - 0 1)

Lindon, Geoffrey

The Observer, 1947

(First published on Sun Jul 6 1947)

1b6/1K2p3/1p1pk2N/4rR2/B7/2N1p3/2Q1P3/8

#2

7 + 7

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Re4
      • 2.Qxe4#
    • 1...Rxf5
      • 2.Qxf5#
  • Tries
    • 1.Qb3+?
      • 1...Rd5
        • 2.Qxd5#
      • 1...d5!
    • 1.Qa2+?
      • 1...Rd5
        • 2.Qxd5#
      • 1...d5!
  • Keys
    • 1.Sb5!
      • 1...Kd5
        • 2.Bb3#
      • 1...Kd7
        • 2.Qc8#
      • 1...Rxb5
        • 2.Qc8#
      • 1...Rxf5
        • 2.Qxf5#
      • 1...Re4
        • 2.Qc8#
      • 1...Rc5
        • 2.Sd4#
      • 1...Rd5
        • 2.Qc8#
      • 1...Ba7
        • 2.Sc7#
      • 1...Bc7
        • 2.Sxc7#
      • 1...d5
        • 2.Qc8#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • R(b);OGATEB::QAR2(A),XR(b)
    • R(b);OGATE,XR(E)::QAB1(A),XR(b)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • R(b);N_GUARD,P_SPINR(b)::QAB1(A),XR(b)
      • Refutation
        • P(d);P_SPINP(d)
    • Try
      • Q(A);CHECK
      • Vars
        • R(b);N_GUARD,P_SPINR(b)::QAB1(A),XR(b)
      • Refutation
        • P(d);P_SPINP(d)
  • Actual
    • S(C);
    • Vars
      • K(e);P_SPINR(b),S_FLIGHT::B(D)
      • K(e);S_FLIGHT::QAB1(A)
      • R(b);XS(C)::QAB(A)
      • R(b);OGATE,XR(E)::QAB1(A),XR(b)
      • R(b);::QAB(A)
      • R(b);::S(C)
      • B(g);N_GUARD::S(C)
      • B(g);N_GUARD::S(C),XB(g)
      • P(d);SBLOCK::QAB(A)
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