MESON Chess Problem Database

Problem Display
PID: 235324 (4K3/8/2n3p1/1R4b1/2PpkB2/3Nq3/1PNpQ1P1/1B3n2 w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

Deutsche Schachzeitung, 1973

4K3/8/2n3p1/1R4b1/2PpkB2/3Nq3/1PNpQ1P1/1B3n2

#2

10 + 8

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Bxf4
      • 2.Sf2#
    • 1...Sb4
      • 2.Re5#
    • 1...Sa5
      • 2.Re5#
    • 1...Se5
      • 2.Rxe5#
    • 1...Sa7
      • 2.Re5#
    • 1...Se7
      • 2.Re5#
    • 1...Sb8
      • 2.Re5#
    • 1...Sd8
      • 2.Re5#
  • Tries
    • 1.Qf3+?
      • 1...Kxd3+
        • 2.Sxe3#
      • 1...Qxf3!
  • Keys
    • 1.Qg4!
      • threat
        • 2.Sc5#
      • 1...Kxd3+
        • 2.Sxe3#
      • 1...Qxf4
        • 2.Sf2#
      • 1...Qxd3
        • 2.Bxg5#
      • 1...Bxf4
        • 2.Qxg6#
      • 1...Be7
        • 2.Qxg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 7
  • Sets
    • B(f);SBLOCK,XB(H)::S(F)
    • S(g);N_GUARD::R1(I)
    • S(g);N_GUARD::R1(I),XS(g)
  • Tries
    • Try
      • Q(D);CHECK,N_PINQ(c)
      • Vars
        • K(e);CHECK,P_SPINQ(c),S_FLIGHT,XS(F)::B(A)+S(C),XQ(c)
      • Refutation
        • Q(c);XQ(D)
  • Actual
    • Q(D);N_PINQ(c)
    • Threat
      • S(F)
    • Vars
      • K(e);CHECK,S_FLIGHT,XS(F)::B(A)+S(C),XQ(c)
      • Q(c);N_GUARD,P_SPINQ(c),XB(H)::S(F)
      • Q(c);N_GUARD,SBLOCK,XS(F)::QAR(D)+B(H),XB(f)
      • B(f);OGATE,P_SPINB(f),XB(H)::QAB(D),XP(h)
      • B(f);OGATE::QAB(D),XP(h)
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