MESON Chess Problem Database

Problem Display
PID: 49688 (b7/8/Q3Nn2/2Pkr2n/N7/6p1/4R3/1K2bB2 w - - 0 1)

Alexander, Frederick Forrest Lawrie

The Puzzler, 1934

b7/8/Q3Nn2/2Pkr2n/N7/6p1/4R3/1K2bB2

#2

7 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Bf2
      • 2.Sc3#
    • 1...Bc3
      • 2.Sxc3#
  • Tries
    • 1.Sf4+?
      • 1...Kd4
        • 2.Qd3#
      • 1...Sxf4!
    • 1.Rd2+?
      • 1...Ke4
        • 2.Qd3#
      • 1...Bxd2!
  • Keys
    • 1.Re4!
      • threat
        • 2.Rd4#
      • 1...Kxe4
        • 2.Qd3#
      • 1...Rxe4
        • 2.Qd6#
      • 1...Rxe6
        • 2.Qxe6#
      • 1...Sxe4
        • 2.Bc4#
      • 1...Bc6
        • 2.Qc4#
      • 1...Rf5
        • 2.Qxa8#
      • 1...Rg5
        • 2.Qxa8#
      • 1...Bf2
        • 2.Sc3#
      • 1...Bc3
        • 2.Sxc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • B(a);N_GUARD::S(D)
    • B(a);N_GUARD::S(D),XB(a)
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • K(c);P-FLIGHT::QAR1(F)
      • Refutation
        • S(e);XS(G)
    • Try
      • R(C);CHECK
      • Vars
        • K(c);S_FLIGHT::QAB1(F)
      • Refutation
        • B(a);XR(C)
  • Actual
    • R(C);
    • Threat
      • R1(C)
    • Vars
      • K(c);S_FLIGHT,XR(C)::QAB1(F)
      • R(d);SBLOCK,XR(C)::QAR1(F)
      • R(d);OGATE,XS(G)::QAB1(F),XR(d)
      • S(f);SBLOCK,XR(C)::B(B)
      • B(g);SBLOCK::QAB1(F)
      • R(d);::QAB(F),XB(g)
      • B(a);N_GUARD::S(D)
      • B(a);N_GUARD::S(D),XB(a)
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