MESON Chess Problem Database

Problem Display
PID: 138985 (3K1b1B/R3p3/3pk1Pp/3pP2P/5p2/3Q2p1/8/8 w - - 0 1)

Thomson, Robert Gavin

The Problemist, 1936

3K1b1B/R3p3/3pk1Pp/3pP2P/5p2/3Q2p1/8/8

#2

7 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Bg7
      • 2.Rxe7#
    • 1...g2
      • 2.Qh3#
    • 1...dxe5
      • 2.Ra6#
  • Tries
    • 1.Qc2?
      • threat
        • 2.Qc8#
      • 1...dxe5
        • 2.Ra6#
      • 1...Bg7
        • 2.Rxe7#
      • 1...d4!
  • Keys
    • 1.g7!
      • threat
        • 2.g8Q#
        • 2.g8B#
      • 1...Kxe5
        • 2.gxf8S#
      • 1...Kf7
        • 2.Qxd5#
      • 1...Bxg7
        • 2.Rxe7#
      • 1...dxe5
        • 2.Qg6#
      • 1...d4
        • 2.g8Q#
        • 2.g8B#
      • 1...f3
        • 2.g8Q#
        • 2.g8B#
      • 1...g2
        • 2.g8Q#
        • 2.g8B#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • B(h);N_GUARD::R1(E),XP(g)
    • P(a);OGATE::QAB(A)
    • P(d);OGATEB,XP(B)::R(E)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAB(A)
      • Vars
        • P(d);OGATEB,XP(B)::R(E)
        • B(h);N_GUARD::R1(E),XP(g)
      • Refutation
        • P(c);
  • Actual
    • P(D);
    • Threat
      • P=Q
    • Vars
      • K(e);P-FLIGHT,XP(B)::PXB(h)=S
      • K(e);P_SPINP(g),S_FLIGHT::QAB(A),XP(c)
      • B(h);N_GUARD,XP(D)::R1(E),XP(g)
      • P(d);SBLOCK,XP(B)::QAR2(A)
      • P(c);::P=Q
      • P(b);::P=Q
      • P(a);::P=Q
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