MESON Chess Problem Database

Problem Display
PID: 240636 (4r3/6p1/1Q6/3ppP2/2PPkp1N/8/1p1R4/3Nn2K w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

Thema Danicum, 1981

4r3/6p1/1Q6/3ppP2/2PPkp1N/8/1p1R4/3Nn2K

#2

8 + 8

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sd3
      • 2.Re2#
    • 1...dxc4
      • 2.Qc6#
      • 2.Qb7#
    • 1...exd4
      • 2.Qxd4#
  • Tries
    • 1.Qd6?
      • threat
        • 2.Qxd5#
      • 1...dxc4
        • 2.Qc6#
      • 1...Rd8
        • 2.Qxe5#
      • 1...f3!
    • 1.Qg6?
      • threat
        • 2.f6#
      • 1...dxc4
        • 2.Qc6#
      • 1...exd4
        • 2.Qxe8#
      • 1...f3
        • 2.Qg4#
      • 1...Sd3!
  • Keys
    • 1.Qb3!
      • threat
        • 2.Sf2#
      • 1...dxc4
        • 2.Qb7#
      • 1...exd4
        • 2.Re2#
      • 1...Sd3
        • 2.Qxd3#
      • 1...f3
        • 2.Qe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(a);SBLOCK::R(C)
    • P(f);OGATE,XP(E)::QAR1(H),XP(f)
  • Tries
    • Try
      • Q(H);
      • Threat
        • QAB1(H),XP(e)
      • Vars
        • P(e);OGATEB,XP(D)::QAB(H)
        • R(h);N_GUARD::QAR1(H),XP(f)
      • Refutation
        • P(d);
    • Try
      • Q(H);
      • Threat
        • QAB(H)+P(G)
      • Vars
        • P(e);OGATEB,XP(D)::QAB(H)
        • P(f);OGATEB,XP(E)::QAR(H),XR(h)
        • P(d);OGATEB::QAR2(H)
      • Refutation
        • S(a);
  • Actual
    • Q(H);
    • Threat
      • S(A)
    • Vars
      • P(e);OGATEB,XP(D)::QAB(H)
      • P(f);SBLOCK,XP(E)::R(C)
      • S(a);N_GUARD::QAB1(H),XS(a)
      • P(d);N_GUARD::QAR1(H)
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