MESON Chess Problem Database

Problem Display
PID: 37731 (7b/2NN4/1r1p3Q/1p6/3kp3/3P2p1/1PP2n1n/2K3B1 w - - 0 1)

Barnes, Barry Peter

1st Prize, Soyuz-Apollo, 1975

7b/2NN4/1r1p3Q/1p6/3kp3/3P2p1/1PP2n1n/2K3B1

#2

8 + 9

3771 FIDE Album (1974-1976) 1980
4199 Barnes about Chess Problems 2001
56 The Problemist 2007

SOLUTION

  • SOUND
  • Sets
    • 1...exd3
      • 2.Qf4#
    • 1...e3
      • 2.Qxh8#
    • 1...d5
      • 2.Qxb6#
  • Tries
    • 1.Bxf2+?
      • 1...e3
        • 2.Bxe3#
        • 2.Qxe3#
        • 2.Qf4#
        • 2.Qxh8#
      • 1...gxf2!
    • 1.Qe6?
      • threat
        • 2.Qxe4#
      • 1...Ke3
        • 2.Qxe4#
      • 1...exd3
        • 2.c3#
      • 1...e3
        • 2.Qd5#
      • 1...d5
        • 2.Qxb6#
      • 1...Be5!
    • 1.Qh7?
      • threat
        • 2.Qxe4#
      • 1...Ke3
        • 2.Qxe4#
      • 1...exd3
        • 2.Qxd3#
      • 1...e3
        • 2.Qxh8#
        • 2.c3#
      • 1...d5!
  • Keys
    • 1.Qg6!
      • threat
        • 2.Qxe4#
      • 1...Ke3
        • 2.Qxe4#
      • 1...exd3
        • 2.Qxd3#
      • 1...e3
        • 2.c3#
      • 1...d5
        • 2.Qxb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • P(e);OGATEB,XP(E)::QAR2(F)
    • P(e);N_SPINS(a),SBLOCK::QAB(F),XB(i)
    • P(h);OGATE::QAB(F),XR(g)
  • Tries
    • Try
      • B(B);CHECK,XS(a)
      • Refutation
        • P(c);XB(B)
    • Try
      • Q(F);
      • Threat
        • QAR1(F),XP(e)
      • Vars
        • K(d);P_SPINP(e),S_FLIGHT::QAR1(F),XP(e)
        • P(e);SBLOCK,XP(E)::P(D)
        • P(e);N_SPINS(a),SBLOCK::QAR1(F)
        • P(h);OGATE::QAB(F),XR(g)
      • Refutation
        • B(i);
    • Try
      • Q(F);
      • Threat
        • QAR1(F),XP(e)
      • Vars
        • K(d);S_FLIGHT::QAR1(F),XP(e)
        • P(e);OGATE,XP(E)::QAR1(F),XP(e)
      • Refutation
        • P(h);
  • Actual
    • Q(F);
    • Threat
      • QAR1(F),XP(e)
    • Vars
      • K(d);S_FLIGHT::QAR1(F),XP(e)
      • P(e);OGATE,XP(E)::QAR1(F),XP(e)
      • P(e);N_SPINS(a),SBLOCK::P(D)
      • P(h);OGATE::QAB(F),XR(g)
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