MESON Chess Problem Database

Problem Display
PID: 270767 (2Q3B1/2ppppr1/n2k2pR/Np6/1P2R1K1/4N3/8/8 w - - 0 1)

Morse, Christopher Jeremy

The Observer, 1959

(First published on Sun Aug 9 1959)

2Q3B1/2ppppr1/n2k2pR/Np6/1P2R1K1/4N3/8/8

#2

8 + 9

17397 Ling Notebooks 2023

SOLUTION

  • SOUND
  • Sets
    • 1...c5
      • 2.Sb7#
    • 1...c6
      • 2.Sb7#
    • 1...e6
      • 2.Qf8#
    • 1...f5+
      • 2.Sxf5#
  • Tries
    • 1.Sac4+?
      • 1...Kc6
        • 2.Qxa6#
        • 2.Qa8#
      • 1...bxc4!
  • Keys
    • 1.Qd8!
      • threat
        • 2.Qxe7#
      • 1...f5+
        • 2.Sxf5#
      • 1...e5
        • 2.Qf6#
      • 1...c5
        • 2.Qb6#
      • 1...c6
        • 2.Sb7#
      • 1...e6
        • 2.Qf8#
      • 1...f6
        • 2.Re6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(e);::S(E)
    • P(g);N_SPINP(d),OGATEB::QAB(G)
    • P(h);CHECK::S(A),XP(h)
  • Tries
    • Try
      • S(E);CHECK
      • Refutation
        • P(a);XS(E)
  • Actual
    • Q(G);
    • Threat
      • QAB1(G),XP(g)
    • Vars
      • P(h);CHECK::S(A),XP(h)
      • P(g);OGATE::QAR2(G)
      • P(e);OGATE::QAR2(G)
      • P(e);SBLOCK::S(E)
      • P(g);N_SPINP(d),OGATEB,P_SPINP(f)::QAB(G)
      • P(h);N_GUARD,N_SPINP(d),P_SPINP(f)::R1(C)
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