MESON Chess Problem Database

Problem Display
PID: 185763 (K1B2B2/2R5/2p2p2/3k1Nnn/2N5/2R1PP2/2pr4/6b1 w - - 0 1)

Holroyd, GC

The Observer, 1931

(First published on Sun Sep 13 1931)

K1B2B2/2R5/2p2p2/3k1Nnn/2N5/2R1PP2/2pr4/6b1

#2

9 + 8

15239 Valois Notebooks 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sh3
      • 2.e4#
    • 1...Se6
      • 2.Rd7#
      • 2.e4#
    • 1...Sf7
      • 2.e4#
    • 1...Sh7
      • 2.e4#
    • 1...c5
      • 2.Se7#
      • 2.Rxc5#
  • Tries
    • 1.Be6+?
      • 1...Sxe6
        • 2.Rd7#
        • 2.e4#
      • 1...Kxe6!
    • 1.Bd6?
      • threat
        • 2.Sb6#
        • 2.Se7#
      • 1...Bxe3
        • 2.Scxe3#
      • 1...Sxf3!
    • 1.Rd3+?
      • 1...Kxc4
        • 2.Ba6#
      • 1...Rxd3!
  • Keys
    • 1.Re7!
      • threat
        • 2.Sb6#
      • 1...Kc5
        • 2.Re5#
      • 1...Bxe3
        • 2.Scxe3#
      • 1...Se6
        • 2.Rd7#
      • 1...c5
        • 2.Bb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • S(e);N_GUARD::P(B)
  • Tries
    • Try
      • B(H);CHECK
      • Refutation
        • K(d);S_FLIGHT,XB(H)
    • Try
      • B(I);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);XP(B)::S(D),XB(a)
      • Refutation
        • S(e);XP(C)
    • Try
      • R(A);CHECK
      • Vars
        • K(d);P_SPINP(g),S_FLIGHT,XS(D)::B(H)
      • Refutation
        • R(c);XR(A)
  • Actual
    • R(F);
    • Threat
      • S(D)
    • Vars
      • K(d);P-FLIGHT::B(I)+R(F),DCHECK
      • B(a);XP(B)::S(D),XB(a)
      • S(e);SBLOCK::R(F)
      • P(g);OGATEB,SBLOCK::B(H)
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