MESON Chess Problem Database

Problem Display
PID: 39983 (2Kbb1RB/1Q1n1k1P/1pPP4/4nP2/2r1N3/1B6/8/8 w - - 0 1)

Barnes, Barry Peter

The Observer, 1955

(First published on Sun Feb 20 1955)

2Kbb1RB/1Q1n1k1P/1pPP4/4nP2/2r1N3/1B6/8/8

#2

10 + 7

4199 Barnes about Chess Problems 2001
15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bg5
      • 2.Sxg5#
    • 1...Bc7
      • 2.Sg5#
    • 1...Sd3
      • 2.Bxc4#
    • 1...Sf3
      • 2.Bxc4#
    • 1...Sg4
      • 2.Bxc4#
    • 1...Sxc6
      • 2.Bxc4#
    • 1...Sg6
      • 2.Bxc4#
  • Tries
    • 1.Kxd8?
      • threat
        • 2.Sg5#
      • 1...Sf3
        • 2.Bxc4#
      • 1...Sxc6+!
    • 1.Qxd7+?
      • 1...Be7
        • 2.Sg5#
        • 2.Qe6#
        • 2.Qxe8#
        • 2.Qxe7#
      • 1...Sxd7
        • 2.Bxc4#
      • 1...Bxd7+!
  • Keys
    • 1.c7!
      • threat
        • 2.Qd5#
      • 1...Sc6
        • 2.Bxc4#
      • 1...Sc5
        • 2.cxd8S#
      • 1...Sf6
        • 2.Sg5#
      • 1...Sf8
        • 2.Rg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • B(f);N_GUARD::S(B),XB(f)
    • B(f);N_GUARD,N_PINP(D),N_SPINS(d)::S(B)
    • S(b);N_GUARD::B(A),XR(a)
    • S(b);N_GUARD,XP(D)::B(A),XR(a)
  • Tries
    • Try
      • K(H);N_SPINP(D),P-FLIGHT,XB(f)
      • Threat
        • S(B)
      • Vars
        • S(b);N_GUARD::B(A),XR(a)
      • Refutation
        • S(b);CHECK,XP(D)
    • Try
      • Q(F);CHECK,XS(d)
      • Vars
        • S(b);XQ(F)::B(A),XR(a)
      • Refutation
        • B(g);CHECK,XQ(F)
  • Actual
    • P(D);N_PINS(d)
    • Threat
      • QAB(F)
    • Vars
      • S(b);N_GUARD,N_PINP(D)::B(A),XR(a)
      • S(d);N_PINP(D)::PXB(f)=S
      • S(d);S_CUTB(f)::S(B)
      • S(d);SBLOCK::R1(I)
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