MESON Chess Problem Database

Problem Display
PID: 245136 (4kB2/6R1/2nQ4/4n3/8/8/8/1K6 w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

Smena (Moscow), 1996

4kB2/6R1/2nQ4/4n3/8/8/8/1K6

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sb4
      • 2.Qe7#
      • 2.Qb8#
    • 1...Sd4
      • 2.Qe7#
      • 2.Qb8#
    • 1...Sa5
      • 2.Qe7#
      • 2.Qb8#
    • 1...Sa7
      • 2.Qe7#
    • 1...Se7
      • 2.Qxe7#
    • 1...Sb8
      • 2.Qe7#
      • 2.Qxb8#
    • 1...Sd8
      • 2.Qe7#
  • Tries
    • 1.Re7+?
      • 1...Sxe7
        • 2.Qxe7#
      • 1...Kxf8!
    • 1.Qe6+?
      • 1...Kxf8
        • 2.Rg8#
        • 2.Qg8#
      • 1...Se7
        • 2.Qxe7#
      • 1...Kd8!
  • Keys
    • 1.Be7!
      • 1...Sxe7
        • 2.Qxe7#
      • 1...Sd3
        • 2.Qxc6#
      • 1...Sf3
        • 2.Qxc6#
      • 1...Sc4
        • 2.Qxc6#
      • 1...Sg4
        • 2.Qxc6#
      • 1...Sg6
        • 2.Qxc6#
      • 1...Sd7
        • 2.Qg6#
      • 1...Sf7
        • 2.Rg8#
      • 1...Sb4
        • 2.Qd8#
      • 1...Sd4
        • 2.Qd8#
      • 1...Sa5
        • 2.Qd8#
      • 1...Sa7
        • 2.Qd8#
      • 1...Sb8
        • 2.Qd8#
      • 1...Sd8
        • 2.Qxd8#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 11
    • REMOVED MATES = 0
  • Sets
    • S(b);N_GUARD::QAR1(B)
    • S(b);N_GUARD::QAR1(B),XS(b)
  • Tries
    • Try
      • R(C);CHECK
      • Vars
        • S(b);OGATE,XR(C)::QAR1(B),XS(b)
      • Refutation
        • K(c);P-FLIGHT,XB(D)
    • Try
      • Q(B);CHECK
      • Vars
        • S(b);N_GUARD,P_SPINS(b)::QAR1(B),XS(b)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • B(D);
    • Vars
      • S(b);OGATE,XB(D)::QAR1(B),XS(b)
      • S(a);N_GUARD::QAB(B),XS(b)
      • S(a);N_GUARD,SBLOCK::QAB(B)
      • S(a);SBLOCK::R(C)
      • S(b);N_GUARD::QAR1(B)
      • S(b);N_GUARD::QAR1(B),XS(b)
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