MESON Chess Problem Database

Problem Display
PID: 7807 (2b1knR1/pNppp1p1/p1PB2Pn/P1P1PpKB/4N1QP/8/8/4R3 w - f5 0 1)

Saunders, Denis M

Comm., The Problemist, 1993/I

2b1knR1/pNppp1p1/p1PB2Pn/P1P1PpKB/4N1QP/8/8/4R3

#2

14 + 11

1085 Australian Chess Problem Magazine 1996
3936 The Wizard of Oz 1999

SOLUTION

  • SOUND
  • Sets
    • 1...Sf7+
      • 2.gxf7#
    • 1...e6
      • 2.Rxf8#
  • Tries
    • 1.Sf6+?
      • 1...exf6+
        • 2.exf6#
      • 1...gxf6+!
    • 1.Qxf5?
      • threat
        • 2.Rxf8#
        • 2.Qxf8#
      • 1...Sf7+
        • 2.Qxf7#
        • 2.gxf7#
      • 1...Sxg8
        • 2.Qf7#
      • 1...dxc6
        • 2.Rxf8#
        • 2.Qxc8#
      • 1...exd6
        • 2.Qxf8#
      • 1...Sxf5!
  • Keys
    • 1.exf5 ep!
      • 1...Sf7+
        • 2.gxf7#
      • 1...exf6+
        • 2.Sxf6#
      • 1...gxf6+
        • 2.Sxf6#
      • 1...Bxb7
        • 2.Qxd7#
      • 1...Sxg4
        • 2.f7#
      • 1...Sxg8
        • 2.f7#
      • 1...cxd6
        • 2.Sexd6#
      • 1...dxc6
        • 2.Qxc8#
      • 1...exd6
        • 2.Sd2#
        • 2.Sf2#
        • 2.Sc3#
        • 2.Sg3#
        • 2.Sexd6#
      • 1...Sf5
        • 2.f7#
      • 1...e5
        • 2.Rxf8#
      • 1...e6
        • 2.Rxf8#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 0
  • Sets
    • S(c);CHECK,OGATE::P(L),XS(c)
    • P(g);::R1(N),XS(k)
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • P(g);CHECK,OGATE,XS(B)::R(A)+P(G),XP(g)
      • Refutation
        • P(h);CHECK,XS(B)
    • Try
      • Q(C);XP(a)
      • Threat
        • DUALS(2)
      • Vars
        • S(c);N_GUARD,N_SPINS(k),XR(N)::QAB1(C)
        • P(g);XB(K)::QAR1(C),XS(k)
      • Refutation
        • S(c);XQ(C)
  • Actual
    • P(G);EP,XP(a)
    • Vars
      • S(c);CHECK,OGATE::P(L),XS(c)
      • P(g);CHECK,XP(G)::R(A)+S(B),DCHECK,XP(g)
      • P(h);CHECK,XP(G)::S(B),XP(h)
      • B(i);N_GUARD,XS(M)::QAB1(C),XP(f)
      • S(c);N_GUARD,XQ(C)::P(G)
      • S(c);N_GUARD,N_SPINS(k),XR(N)::P(G)
      • P(e);XB(K)::S(B),XP(e)
      • P(f);OGATE,XP(J)::QAR2(C),XB(i)
      • S(c);N_GUARD::P(G)
      • P(g);::R1(N),XS(k)
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