MESON Chess Problem Database

Problem Display
PID: 542 (QN1Nk2r/2pp1p2/p2prB2/1P2pB2/qp3p2/PP6/P2KP3/8 w - - 0 1)

Barnes, Barry Peter

The Observer, 1962

QN1Nk2r/2pp1p2/p2prB2/1P2pB2/qp3p2/PP6/P2KP3/8

#2

11 + 12

1111 Busmen's Chess Review 1964
3174 The Two-move Chess Problem Tradition and Development 1966

SOLUTION

  • SOUND
  • Tries
    • 1.Sxa6?
      • threat
        • 2.Sc6#
        • 2.Sxe6#
        • 2.Sb7#
      • 1...Kf8
        • 2.Sxe6#
      • 1...Qxb5
        • 2.Sb7#
      • 1...Rxf6
        • 2.Sc6#
      • 1...Re7
        • 2.Sc6#
        • 2.Se6#
        • 2.Sb7#
      • 1...c6
        • 2.Sxc6#
        • 2.Sxe6#
        • 2.Sb7#
      • 1...Qxa6!
  • Keys
    • 1.Sb7!
      • threat
        • 2.Sxa6#
        • 2.Sc6#
      • 1...Kf8
        • 2.Sxd7#
      • 1...Rxf6
        • 2.Sc6#
      • 1...axb5
        • 2.Sa6#
      • 1...a5
        • 2.Sa6#
        • 2.Sc6#
      • 1...c6
        • 2.Sxa6#
        • 2.Sxc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(J);XP(e)
      • Threat
        • DUALS(3)
      • Vars
        • K(k);P-FLIGHT::QAR(I)+S(K),DCHECK,XR(g)
        • Q(a);XP(F)::QAR(I)+S(K)
        • R(g);XB(H)::QAR(I)+S(K)
      • Refutation
        • Q(a);XS(J)
  • Actual
    • S(K);
    • Threat
      • DUALS(2)
    • Vars
      • K(k);P-FLIGHT::QAR(I)+S(J),DCHECK,XP(i)
      • R(g);XB(H)::QAR(I)+S(J)
      • P(e);XP(F)::QAR(I)+S(J)
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