MESON Chess Problem Database

Problem Display
PID: 194522 (q3bN2/b7/3k1P2/B1NP1p1p/2Q2P2/1B3K2/8/8 w - - 0 1)

Holroyd, GC

The Observer, 1940

(First published on Sun Dec 15 1940)

q3bN2/b7/3k1P2/B1NP1p1p/2Q2P2/1B3K2/8/8

#2

9 + 6

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd5+
      • 2.Qxd5#
    • 1...Qb7
      • 2.Sxb7#
    • 1...Qd8
      • 2.Sb7#
  • Keys
    • 1.Qe4!
      • threat
        • 2.Qe7#
      • 1...fxe4+
        • 2.Sxe4#
      • 1...Kxc5
        • 2.Qb4#
      • 1...Qxd5
        • 2.Qxd5#
      • 1...Qb7
        • 2.Sxb7#
      • 1...Qd8
        • 2.Sb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(e);CHECK,OGATE,XP(G)::QAR1(C),XQ(e)
    • Q(e);N_GUARD::S(F),XQ(e)
    • Q(e);N_GUARD,N_PINP(G)::S(F)
  • Actual
    • Q(C);N_SPINP(G)
    • Threat
      • QAB1(C)
    • Vars
      • P(a);CHECK,XQ(C)::S(F),XP(a)
      • K(c);OGATEB,S_FLIGHT,XS(F)::QAB1(C)
      • Q(e);OGATE,P_PINQ(C),XP(G)::QAR1(C),XQ(e)
      • Q(e);N_GUARD::S(F),XQ(e)
      • Q(e);N_GUARD::S(F)
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