MESON Chess Problem Database

Problem Display
PID: 64073 (2Qn1B2/rr6/3NPk2/1b1P1p1P/3P3K/1p6/8/8 w - - 0 1)

Gunn, Robert Ivan

Chess, 1946

2Qn1B2/rr6/3NPk2/1b1P1p1P/3P3K/1p6/8/8

#2

8 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Rd7
      • 2.Se8#
    • 1...Bf1
      • 2.Se8#
    • 1...Be2
      • 2.Se8#
    • 1...Bd3
      • 2.Se8#
    • 1...Bc4
      • 2.Se8#
    • 1...Ba6
      • 2.Se8#
    • 1...Bd7
      • 2.Qxd8#
    • 1...Be8
      • 2.Sxe8#
    • 1...Sc6
      • 2.Se8#
    • 1...Sxe6
      • 2.Qxe6#
  • Tries
    • 1.Qd7?
      • threat
        • 2.Se8#
        • 2.Bg7#
      • 1...Rxd7
        • 2.Se8#
      • 1...Sxe6
        • 2.Se8#
        • 2.Qxe6#
      • 1...Sf7
        • 2.Se8#
      • 1...f4
        • 2.Bg7#
      • 1...Bxd7!
    • 1.Qc2?
      • threat
        • 2.Qxf5#
      • 1...Bd3
        • 2.Se8#
      • 1...f4
        • 2.Qf5#
        • 2.Qg6#
      • 1...bxc2!
  • Keys
    • 1.e7!
      • threat
        • 2.Qxf5#
      • 1...Rd7
        • 2.e8S#
      • 1...Bd3
        • 2.e8S#
      • 1...Bd7
        • 2.exd8Q#
        • 2.exd8B#
      • 1...Se6
        • 2.Qxe6#
      • 1...f4
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 7
  • Sets
    • R(f);S_CUTB(b)::S(E)
    • B(b);N_GUARD::S(E)
    • B(b);S_CUTR(f)::QAB(G),XS(g)
    • B(b);N_GUARD::S(E),XB(b)
    • S(g);S_CUTB(b)::S(E)
    • S(g);OGATE,XP(F)::QAR1(G),XS(g)
  • Tries
    • Try
      • Q(G);
      • Threat
        • DUALS(2)
      • Vars
        • R(f);XQ(G)::S(E)
        • S(g);::S(E)
        • P(c);::B(H)
      • Refutation
        • B(b);XQ(G)
    • Try
      • Q(G);
      • Threat
        • QAR1(G),XP(c)
      • Vars
        • B(b);N_GUARD::S(E)
      • Refutation
        • P(a);XQ(G)
  • Actual
    • P(F);
    • Threat
      • QAR1(G),XP(c)
    • Vars
      • R(f);S_CUTB(b)::P=S
      • B(b);N_GUARD::P=S
      • B(b);S_CUTR(f)::PXS(g)=Q
      • S(g);N_GUARD::QAR1(G),XS(g)
      • P(c);::QAR1(G)
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