MESON Chess Problem Database

Problem Display
PID: 237798 (1N4B1/1p2qPBK/1p6/1NkpnR1p/P5p1/PP3p2/2b1r3/2R5 w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

Arbejder-Skak, 1944

1N4B1/1p2qPBK/1p6/1NkpnR1p/P5p1/PP3p2/2b1r3/2R5

#2

11 + 11

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qf8
      • 2.Bxf8#
    • 1...Sd3
      • 2.Bd4#
    • 1...Sc4
      • 2.Bd4#
      • 2.b4#
    • 1...Sg6
      • 2.Bd4#
    • 1...Sd7
      • 2.Bd4#
    • 1...Sxf7
      • 2.Bd4#
  • Tries
    • 1.Rxc2+?
      • 1...Sc4
        • 2.Bd4#
        • 2.Rxc4#
        • 2.b4#
      • 1...Rxc2!
    • 1.f8B?
      • threat
        • 2.Bxe7#
      • 1...Qxf8
        • 2.Bxf8#
      • 1...Qd6
        • 2.Bxd6#
      • 1...Sd3
        • 2.Rxd5#
      • 1...Sc4
        • 2.b4#
      • 1...Sc6
        • 2.Sd7#
      • 1...Sg6
        • 2.Rxd5#
      • 1...Sf7
        • 2.Bd4#
      • 1...Sd7!
  • Keys
    • 1.f8Q!
      • threat
        • 2.Qxe7#
      • 1...Qxf8
        • 2.Bxf8#
      • 1...Qd6
        • 2.Qxd6#
      • 1...Sd3
        • 2.Rxd5#
      • 1...Sc4
        • 2.b4#
      • 1...Sc6
        • 2.Sd7#
      • 1...Sg6
        • 2.Rxd5#
      • 1...Sd7
        • 2.Qc8#
      • 1...Sf7
        • 2.Bd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • Q(k);OGATEB::B(H),XQ(k)
    • S(g);N_PINR(F),OGATE,P_SPINP(f)::B(H)
    • S(g);OGATE,P_SPINP(f)::B(H)
    • S(g);OGATE,P_SPINP(f),XP(G)::B(H)
  • Tries
    • Try
      • R(A);CHECK,N_SPINR(F),XB(a)
      • Refutation
        • R(b);XR(A)
    • Try
      • P(G);P_PINQ(k),P_SPINB(H)
      • Threat
        • B(G),XQ(k)
      • Vars
        • Q(k);N_PINB(H),N_SPINQ(k),XB(G)::B(H),XQ(k)
        • Q(k);N_PINB(H),OGATE::B(G),XQ(k)
        • S(g);N_PINR(F),P_SPINP(f)::R1(F),XP(f)
        • S(g);N_SPINB(a),P_SPINP(f),SBLOCK::P(C)
        • S(g);N_GUARD,P_SPINP(f),SBLOCK::S(J)
        • S(g);N_PINB(H),P_SPINP(f)::B(H)
      • Refutation
        • S(g);P_SPINP(f)
  • Actual
    • P(G);P_PINQ(k),P_SPINB(H)
    • Threat
      • QAB(G),XQ(k)
    • Vars
      • Q(k);N_PINB(H),N_SPINQ(k),XQ(G)::B(H),XQ(k)
      • Q(k);N_PINB(H),OGATE::QAB1(G),XQ(k)
      • S(g);N_PINR(F),P_SPINP(f)::R1(F),XP(f)
      • S(g);N_SPINB(a),P_SPINP(f),SBLOCK::P(C)
      • S(g);N_GUARD,P_SPINP(f),SBLOCK::S(J)
      • S(g);N_GUARD,P_SPINP(f)::QAR(G)
      • S(g);N_PINB(H),P_SPINP(f)::B(H)
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Developed and maintained by Brian Stephenson.
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