MESON Chess Problem Database

Problem Display
PID: 264961 (8/2b5/p7/1R3N2/rPk1p3/1rn4K/P1B1pN2/2QbB3 w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

Probleemblad, 1949

8/2b5/p7/1R3N2/rPk1p3/1rn4K/P1B1pN2/2QbB3

#2

9 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Sb1+
      • 2.Bd3#
    • 1...Sxa2+
      • 2.Bd3#
    • 1...Sxb5+
      • 2.Bxb3#
    • 1...Sd5+
      • 2.Bd3#
    • 1...e3
      • 2.Bd3#
  • Tries
    • 1.Se3+?
      • 1...Kd4
        • 2.Qd2#
      • 1...Kxb5!
    • 1.Sd6+?
      • 1...Kd4
        • 2.Qd2#
      • 1...Bxd6!
  • Keys
    • 1.Qe3!
      • threat
        • 2.Qc5#
      • 1...Kxb5
        • 2.Qc5#
      • 1...Sxa2
        • 2.Rc5#
      • 1...Sxb5
        • 2.Qxb3#
      • 1...Bb6
        • 2.Sd6#
      • 1...Bd6
        • 2.Sxd6#
      • 1...Sb1
        • 2.Rc5#
      • 1...Sd5
        • 2.Rc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • S(d);CHECK::QAR(A)+B(D),DCHECK
    • S(d);CHECK,XP(C)::QAR(A)+B(D),DCHECK
    • S(d);CHECK,SBLOCK,XR(H)::QAR(A)+B(D),DCHECK,XR(c)
    • P(g);N_GUARD::B(D)
  • Tries
    • Try
      • S(I);CHECK
      • Vars
        • K(f);N_GUARD,P-FLIGHT::QAR2(A)
      • Refutation
        • K(f);S_FLIGHT,XR(H)
    • Try
      • S(I);CHECK
      • Vars
        • K(f);P-FLIGHT,S_CUTB(i)::QAR2(A)
      • Refutation
        • B(i);XS(I)
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • K(f);S_FLIGHT,XR(H)::QAR1(A)
      • S(d);P_PINQ(A),XP(C)::R1(H)
      • S(d);OGATE,P_PINQ(A),SBLOCK,XR(H)::QAB1(A),XR(c)
      • B(i);N_GUARD::S(I)
      • B(i);N_GUARD::S(I),XB(i)
      • S(d);P_PINQ(A)::R1(H)
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Developed and maintained by Brian Stephenson.
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