MESON Chess Problem Database

Problem Display
PID: 145874 (8/K1p4b/8/2N2p2/2R1rkPP/6p1/1QnrBq2/1nBN1Rb1 w - - 0 1)

Sumner, Christopher Richard Benson

The Observer, 1927

(First published on Sun Jul 31 1927)

8/K1p4b/8/2N2p2/2R1rkPP/6p1/1QnrBq2/1nBN1Rb1

#2

10 + 11

14868 Pirnie Collection 2012
15239 Valois Notebooks 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Se3
      • 2.Se6#
    • 1...Sd4
      • 2.Sd3#
    • 1...c6
      • 2.Qb8#
  • Tries
    • 1.Bxd2+?
      • 1...Se3
        • 2.Sd3#
        • 2.Se6#
        • 2.Bxe3#
      • 1...Sxd2!
  • Keys
    • 1.Qg7!
      • threat
        • 2.Qxc7#
      • 1...fxg4
        • 2.Qg5#
      • 1...Qf3
        • 2.Rxf3#
      • 1...Se3
        • 2.Se6#
      • 1...Sd4
        • 2.Sd3#
      • 1...c6
        • 2.Qc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(c);N_PINS(I),N_SPINR(d),P_SPINR(g)::S(I)
    • S(c);N_PINS(I)::S(I)
    • P(j);OGATEB::QAB(D)
  • Tries
    • Try
      • B(A);CHECK,P_PINR(g),XR(d)
      • Refutation
        • S(a);XB(A)
  • Actual
    • Q(D);
    • Threat
      • QAB(D),XP(j)
    • Vars
      • P(i);XP(G)::QAB1(D)
      • Q(e);OGATE::R1(C),XQ(e)
      • S(c);N_PINS(I),N_SPINR(d),P_SPINR(g)::S(I)
      • S(c);N_PINS(I)::S(I)
      • P(j);::QAB(D)
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