MESON Chess Problem Database

Problem Display
PID: 240622 (8/2Q5/2KRN3/4kppn/2p1r2b/4pp1P/8/8 w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

Thema Danicum, 1980

8/2Q5/2KRN3/4kppn/2p1r2b/4pp1P/8/8

#2

5 + 9

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sg3
      • 2.Qg7#
    • 1...Sf4
      • 2.Qg7#
    • 1...Sg7
      • 2.Qxg7#
  • Tries
    • 1.Sf8?
      • threat
        • 2.Sg6#
      • 1...Kf4
        • 2.Rd4#
      • 1...Rd4
        • 2.Re6#
      • 1...Rf4
        • 2.Qe7#
      • 1...Sf4
        • 2.Sd7#
        • 2.Qg7#
      • 1...f4
        • 2.Qa5#
      • 1...Rg4!
    • 1.Rd7+?
      • 1...Kxe6
        • 2.Qd6#
      • 1...Kf6!
  • Keys
    • 1.Sf4!
      • threat
        • 2.Sg6#
      • 1...Kxf4
        • 2.Rd4#
      • 1...Rxf4
        • 2.Qe7#
      • 1...Sxf4
        • 2.Qg7#
      • 1...gxf4
        • 2.Qa5#
      • 1...Rd4
        • 2.Re6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • S(i);N_GUARD::QAB(E)
    • S(i);N_GUARD::QAB(E),XS(i)
  • Tries
    • Try
      • S(D);
      • Threat
        • S(D)
      • Vars
        • K(f);S_FLIGHT::QAB(E)+R(C)
        • R(d);SBLOCK::QAB(E)+R(C),DCHECK
        • R(d);SBLOCK::QAR2(E)
        • P(g);SBLOCK::QAR(E)
      • Refutation
        • R(d);
    • Try
      • R(C);CHECK
      • Vars
        • K(f);P-FLIGHT,XS(D)::QAR1(E)
      • Refutation
        • K(f);S_FLIGHT
  • Actual
    • S(D);
    • Threat
      • S(D)
    • Vars
      • K(f);S_FLIGHT,XS(D)::QAB(E)+R(C)
      • R(d);SBLOCK,XS(D)::QAR2(E)
      • S(i);N_GUARD,SBLOCK,XS(D)::QAB(E)
      • P(h);SBLOCK,XS(D)::QAR(E)
      • R(d);SBLOCK::QAB(E)+R(C),DCHECK
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