MESON Chess Problem Database

Problem Display
PID: 431 (8/6p1/4p3/p6b/k1KN1pq1/3p4/2N5/3B2nr w - - 0 1)

Sprague, Gordon

The Observer, 1948

(First published on Sun Nov 7 1948)

8/6p1/4p3/p6b/k1KN1pq1/3p4/2N5/3B2nr

#2

4 + 10

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Keys
    • 1.Sb5!
      • threat
        • 2.Sc3#
      • 1...f3+
        • 2.Scd4#
      • 1...dxc2
        • 2.Bxc2#
      • 1...Se2
        • 2.Se1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Actual
    • S(D);
    • Threat
      • S(D)
    • Vars
      • P(e);CHECK,S_CUTQ(f)::B(A)+S(B)
      • P(c);OGATE,P_SPINP(c),XS(B)::B(A),XP(c)
      • S(a);S_CUTQ(f)::B(A)+S(B)
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