MESON Chess Problem Database

Problem Display
PID: 210242 (K1R2Q1r/N3b1Nb/pP1k2n1/p1n2pr1/B1P2P2/8/3B4/8 w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

Deutsche Schachblatter, 1984

K1R2Q1r/N3b1Nb/pP1k2n1/p1n2pr1/B1P2P2/8/3B4/8

#2

10 + 10

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Se6
      • 2.Se8#
    • 1...Sd7
      • 2.Rc6#
    • 1...Sxf4
      • 2.Bxf4#
  • Tries
    • 1.Sb5+?
      • 1...Kd7
        • 2.Rc7#
      • 1...axb5!
    • 1.Be3?
      • threat
        • 2.Bxc5#
      • 1...Sxa4
        • 2.Rd8#
      • 1...Sxf4
        • 2.Bxf4#
      • 1...Sb3
        • 2.Rd8#
      • 1...Sd3
        • 2.Rd8#
      • 1...Se4
        • 2.Rd8#
      • 1...Se6
        • 2.Se8#
      • 1...Sd7
        • 2.Rc6#
      • 1...Sb7!
    • 1.Rc7?
      • threat
        • 2.Sc8#
      • 1...Sxf4
        • 2.Bxf4#
      • 1...Rxf8+!
    • 1.Qf6+?
      • 1...Se6
        • 2.Qxe6#
      • 1...Bxf6!
  • Keys
    • 1.Qf7!
      • threat
        • 2.Qd5#
      • 1...Rxc8+
        • 2.Sxc8#
      • 1...Sxf4
        • 2.Bxf4#
      • 1...Bf6
        • 2.Qc7#
      • 1...Bd8
        • 2.Rc6#
      • 1...Bf8
        • 2.Se8#
        • 2.Rc6#
        • 2.Qc7#
      • 1...Bg8
        • 2.Se8#
      • 1...Se6
        • 2.Qxe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • S(b);SBLOCK::S(G)
    • S(b);SBLOCK::R1(I)
    • S(g);OGATE,XP(D)::B(A),XS(g)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(f);N_SPINB(h),P-FLIGHT::R1(I)
      • Refutation
        • P(e);XS(F)
    • Try
      • B(A);
      • Threat
        • B(A),XS(b)
      • Vars
        • S(b);N_GUARD,XB(B)::R(I)
        • S(g);OGATE,XP(D)::B(A),XS(g)
        • S(b);N_GUARD::R(I)
        • S(b);SBLOCK::S(G)
        • S(b);SBLOCK::R1(I)
      • Refutation
        • S(b);
    • Try
      • R(I);P_SPINQ(J)
      • Threat
        • S(F)
      • Vars
        • S(g);OGATE,XP(D)::B(A),XS(g)
      • Refutation
        • R(j);CHECK,N_SPINB(h),XQ(J)
    • Try
      • Q(J);CHECK,N_PINB(h),P_SPINR(I)
      • Vars
        • S(b);N_GUARD,P_SPINS(b)::QAR1(J),XS(b)
      • Refutation
        • B(h);XQ(J)
  • Actual
    • Q(J);N_PINB(h),P_SPINR(I)
    • Threat
      • QAR1(J)
    • Vars
      • R(j);CHECK,XR(I)::S(F),XR(j)
      • S(g);OGATE,XP(D)::B(A),XS(g)
      • B(h);OGATE::QAB1(J)
      • B(h);N_PINR(I)::R1(I)
      • B(i);N_PINR(I),S_CUTR(j)::S(G)
      • S(b);N_GUARD::QAR1(J),XS(b)
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