MESON Chess Problem Database

Problem Display
PID: 196509 (n3B3/3Rp3/P1k1r3/3b4/PR2p3/1p2B3/4K2b/8 w - - 0 1)

Stubbs, Arthur Goodwin

The Observer, 1943

(First published on Sun Aug 15 1943)

n3B3/3Rp3/P1k1r3/3b4/PR2p3/1p2B3/4K2b/8

#2

7 + 8

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Bd6
      • 2.Ra7#
      • 2.Rdb7#
      • 2.Rxe7#
    • 1...Bc7
      • 2.Rd8#
    • 1...Bc4+
      • 2.Rxc4#
    • 1...Sb6
      • 2.Rxb6#
    • 1...Sc7
      • 2.Rb6#
  • Keys
    • 1.Rbb7!
      • threat
        • 2.Rd8#
      • 1...Bc4+
        • 2.Rd3#
      • 1...Rd6
        • 2.Rdc7#
      • 1...Sb6
        • 2.Rxb6#
      • 1...Sc7
        • 2.Rb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • B(a);SBLOCK::B(G)+R(F)
    • B(d);CHECK,N_GUARD::R(D),XB(d)
    • S(h);N_GUARD::R1(D),XS(h)
    • S(h);N_GUARD::R1(D)
  • Actual
    • R(D);
    • Threat
      • B(G)+R(F)
    • Vars
      • B(d);CHECK,OGATE::B(G)+R(F)
      • R(f);SBLOCK::B(G)+R(F),DCHECK
      • S(h);N_GUARD::R1(D),XS(h)
      • S(h);N_GUARD::R1(D)
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