MESON Chess Problem Database

Problem Display
PID: 255831 (3n2N1/2bn1P2/1p1kpp2/1BRrN3/8/2Q5/2KB4/3R4 w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

Probleemblad, 1984

3n2N1/2bn1P2/1p1kpp2/1BRrN3/8/2Q5/2KB4/3R4

#2

9 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd2+
      • 2.Rxd2#
    • 1...Rd4
      • 2.Qxd4#
    • 1...Rxe5
      • 2.Bf4#
    • 1...Sxc5
      • 2.Sc4#
      • 2.f8Q#
      • 2.f8B#
    • 1...Sxe5
      • 2.f8Q#
      • 2.f8B#
    • 1...Sb8
      • 2.f8Q#
      • 2.f8B#
    • 1...Sc6
      • 2.Rxc6#
    • 1...Sb7
      • 2.Rc6#
    • 1...Sxf7
      • 2.Sxf7#
      • 2.Rc6#
    • 1...bxc5
      • 2.Sc4#
  • Tries
    • 1.Be3?
      • threat
        • 2.Sc4#
      • 1...Rd2+
        • 2.Rxd2#
        • 2.Qxd2#
      • 1...Sxe5
        • 2.f8Q#
        • 2.f8B#
      • 1...Rd4
        • 2.Rxd4#
        • 2.Qxd4#
      • 1...fxe5!
  • Keys
    • 1.Qb4!
      • threat
        • 2.Sc4#
      • 1...Rxd2+
        • 2.Rxd2#
      • 1...Rxc5+
        • 2.Bc3#
      • 1...Kxe5
        • 2.Qf4#
      • 1...Rxe5
        • 2.Bf4#
      • 1...Sxe5
        • 2.f8Q#
        • 2.f8B#
      • 1...fxe5
        • 2.Rc6#
      • 1...Rd4
        • 2.Qxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • R(a);CHECK,OGATE,P_SPINR(a),XB(C)::R(A),XR(a)
    • R(a);OGATEB::QAR2(D),XR(a)
    • R(a);OGATEB,XS(G)::R(A)+B(C)
    • S(g);N_GUARD,XS(G)::P=Q
    • S(g);N_GUARD::P=Q
    • S(h);N_GUARD::R1(F),XS(h)
    • S(h);N_GUARD::R1(F)
    • P(b);SBLOCK,XR(F)::S(G)
  • Tries
    • Try
      • B(C);P_PINR(a)
      • Threat
        • S(G)
      • Vars
        • S(g);N_GUARD,XS(G)::P=Q
      • Refutation
        • P(e);XS(G)
  • Actual
    • Q(D);
    • Threat
      • S(G)
    • Vars
      • R(a);CHECK,OGATE,P_SPINR(a),XB(C)::R(A),XR(a)
      • R(a);CHECK,OGATEB,P_SPINR(a),XR(F)::R(A)+B(C)
      • K(c);OGATEB,P_SPINR(a),S_FLIGHT,XS(G)::QAB1(D)
      • R(a);OGATEB,XS(G)::R(A)+B(C)
      • S(g);N_GUARD,SBLOCK,XS(G)::P=Q
      • P(e);SBLOCK,XS(G)::QAB(D)+R(F),DCHECK
      • R(a);OGATEB::QAR2(D),XR(a)
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