MESON Chess Problem Database

Problem Display
PID: 103811 (3n2Q1/3P1q2/3B2R1/1B1k3K/2R3p1/8/8/8 w - - 0 1)

van Dijk, Nils Gustav Gerard

En Passant, 1979

3n2Q1/3P1q2/3B2R1/1B1k3K/2R3p1/8/8/8

#2

7 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sc6
      • 2.Qxf7#
    • 1...Sb7
      • 2.Qxf7#
  • Tries
    • 1.Bc6+?
      • 1...Sxc6
        • 2.Qxf7#
      • 1...Kxc4!
    • 1.Bh2?
      • 1...Qxg8
        • 2.Rd6#
      • 1...Qe6
        • 2.Rg5#
      • 1...Sc6
        • 2.Qxf7#
      • 1...Se6
        • 2.Qa8#
      • 1...Sb7
        • 2.Qxf7#
      • 1...g3!
    • 1.Bf4?
      • 1...Qxg8
        • 2.Rd6#
      • 1...Qe6
        • 2.Rg5#
      • 1...Sc6
        • 2.Qxf7#
      • 1...Se6
        • 2.Qa8#
      • 1...Sb7
        • 2.Qxf7#
      • 1...g3!
    • 1.Qxf7+?
      • 1...Se6
        • 2.Qxe6#
      • 1...Sxf7!
  • Keys
    • 1.Bg3!
      • 1...Qxg8
        • 2.Rd6#
      • 1...Qe6
        • 2.Rg5#
      • 1...Sc6
        • 2.Qxf7#
      • 1...Se6
        • 2.Qa8#
      • 1...Sb7
        • 2.Qxf7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(d);N_GUARD::QAB(G),XQ(c)
  • Tries
    • Try
      • B(B);CHECK
      • Vars
        • S(d);XB(B)::QAB(G),XQ(c)
      • Refutation
        • K(b);S_FLIGHT,XR(A)
    • Try
      • B(D);
      • Vars
        • Q(c);N_PINR(E),N_SPINQ(c),XQ(G)::R1(E)
        • Q(c);N_PINR(E)::R(E)
        • S(d);N_GUARD::QAB(G),XQ(c)
        • S(d);N_SPINQ(c),OGATE::QAB(G)
      • Refutation
        • P(a);
    • Try
      • B(D);
      • Vars
        • Q(c);N_PINR(E),N_SPINQ(c),XQ(G)::R1(E)
        • Q(c);N_PINR(E)::R(E)
        • S(d);N_GUARD::QAB(G),XQ(c)
        • S(d);N_SPINQ(c),OGATE::QAB(G)
      • Refutation
        • P(a);
    • Try
      • Q(G);CHECK,N_SPINR(E),XQ(c)
      • Vars
        • S(d);N_GUARD,P_SPINS(d)::QAB1(G),XS(d)
      • Refutation
        • S(d);XQ(G)
  • Actual
    • B(D);
    • Vars
      • Q(c);N_PINR(E),N_SPINQ(c),XQ(G)::R1(E)
      • Q(c);N_PINR(E)::R(E)
      • S(d);N_GUARD::QAB(G),XQ(c)
      • S(d);N_SPINQ(c),OGATE::QAB(G)
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