MESON Chess Problem Database

Problem Display
PID: 108492 (n1b5/5Q1K/4P1p1/3Pk1b1/1B3RP1/7P/4n3/7B w - - 0 1)

Jespersen, Karl Lorenz Jesper

Amsterdammer, 1898

n1b5/5Q1K/4P1p1/3Pk1b1/1B3RP1/7P/4n3/7B

#2

9 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bxf4
      • 2.Qg7#
    • 1...Bf6
      • 2.Qxf6#
    • 1...Bh6
      • 2.Qf6#
    • 1...Sb6
      • 2.Qc7#
    • 1...Sc7
      • 2.Qxc7#
  • Tries
    • 1.Qg7+?
      • 1...Bf6
        • 2.Qxf6#
      • 1...Kxf4!
    • 1.Qf8?
      • threat
        • 2.Bd6#
        • 2.Qd6#
      • 1...Bxf4
        • 2.Qg7#
        • 2.Qh8#
      • 1...Sxf4
        • 2.Bc3#
      • 1...Be7!
  • Keys
    • 1.Qa7!
      • threat
        • 2.Qe3#
      • 1...Kxf4
        • 2.Bd6#
      • 1...Bxf4
        • 2.Qg7#
      • 1...Sxf4
        • 2.Qa1#
      • 1...Sc3
        • 2.Qd4#
      • 1...Sg3
        • 2.Qd4#
      • 1...Sd4
        • 2.Qxd4#
      • 1...Sb6
        • 2.Qb8#
        • 2.Qc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 4
  • Sets
    • B(c);N_GUARD,SBLOCK,XR(D)::QAB(H)
    • B(c);N_GUARD::QAB1(H),XB(c)
    • B(c);N_GUARD::QAB1(H)
    • S(e);N_GUARD::QAB(H)
    • S(e);N_GUARD::QAB(H),XS(e)
  • Tries
    • Try
      • Q(H);CHECK
      • Vars
        • B(c);N_GUARD,P_SPINB(c)::QAB1(H),XB(c)
      • Refutation
        • K(b);S_FLIGHT,XR(D)
    • Try
      • Q(H);
      • Threat
        • DUALS(2)
      • Vars
        • S(a);N_GUARD,XR(D)::B(C)
      • Refutation
        • B(c);
  • Actual
    • Q(H);
    • Threat
      • QAR2(H)
    • Vars
      • K(b);S_FLIGHT,XR(D)::B(C)
      • B(c);N_GUARD,SBLOCK,XR(D)::QAB(H)
      • S(a);N_GUARD,SBLOCK,XR(D)::QAB(H)
      • S(a);N_GUARD::QAB1(H)
      • S(a);N_GUARD::QAB1(H),XS(a)
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