MESON Chess Problem Database

Problem Display
PID: 148840 (2qN1r2/2P3Q1/3P2Pb/RBN1nkpK/8/3PPPR1/8/2n5 w - - 0 1)

Fontana, Don A

Good Companions (March), 1918

2qN1r2/2P3Q1/3P2Pb/RBN1nkpK/8/3PPPR1/8/2n5

#2

13 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Sxf3
      • 2.Rxf3#
    • 1...Sg4
      • 2.fxg4#
  • Tries
    • 1.Bd7+?
      • 1...Sxd7
        • 2.Sxd7#
      • 1...Qxd7!
  • Keys
    • 1.Sd7!
      • threat
        • 2.Qxe5#
      • 1...Qxd7
        • 2.Bxd7#
      • 1...Bxg7
        • 2.Rxg5#
      • 1...Scxd3
        • 2.Bxd3#
      • 1...Sexd3
        • 2.Bxd3#
      • 1...Sxf3
        • 2.Rxf3#
      • 1...Sxg6
        • 2.Qxg6#
      • 1...Sxd7
        • 2.Bxd7#
      • 1...Rf6
        • 2.Qxf6#
      • 1...Re8
        • 2.Qf6#
      • 1...Sc4
        • 2.Bxc4#
      • 1...Sg4
        • 2.fxg4#
      • 1...Sc6
        • 2.Bxc6#
      • 1...Sf7
        • 2.Qf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 11
    • REMOVED MATES = 0
  • Sets
    • S(b);OGATE,XP(C)::R(D),XS(b)
    • S(b);OGATE::P(C),XS(b)
  • Tries
    • Try
      • B(F);CHECK
      • Vars
        • S(b);XB(F)::R(E)+S(G),XS(b)
      • Refutation
        • Q(f);XB(F)
  • Actual
    • S(G);
    • Threat
      • QAR1(L),XS(b)
    • Vars
      • Q(f);OGATE,XS(G)::B(F),XQ(f)
      • B(e);N_GUARD,XQ(L)::R1(D),XP(d)
      • S(a);OGATE,XP(A)::B(F),XS(a)
      • S(b);OGATE,XP(A)::R(E)+B(F),DCHECK,XS(b)
      • S(b);OGATE,XP(C)::R(D),XS(b)
      • S(b);OGATE,XP(J)::QAB1(L),XS(b)
      • S(b);OGATE,XS(G)::R(E)+B(F),DCHECK,XS(b)
      • R(g);N_GUARD::QAR1(L),XR(g)
      • R(g);N_GUARD::QAR1(L)
      • S(b);OGATEB::R(E)+B(F),XS(b)
      • S(b);OGATE::P(C),XS(b)
      • S(b);S_CUTR(g)::QAR1(L)
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