MESON Chess Problem Database

Problem Display
PID: 276429 (4K3/8/4N1R1/R1p1k2P/2p1r3/2P1rP2/2QB4/4q3 w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

Mat, 1981

4K3/8/4N1R1/R1p1k2P/2p1r3/2P1rP2/2QB4/4q3

#2

9 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Kf5
      • 2.Rxc5#
  • Tries
    • 1.Ke7?
      • threat
        • 2.Rxc5#
        • 2.Rg5#
      • 1...Kd5
        • 2.Rxc5#
      • 1...Kf5
        • 2.Rxc5#
        • 2.Rg5#
      • 1...Qxd2
        • 2.Rg5#
      • 1...Rxf3
        • 2.Rxc5#
      • 1...Qg3
        • 2.Rxc5#
      • 1...Qg1
        • 2.Rxc5#
      • 1...Rd3
        • 2.Rg5#
      • 1...Rd4
        • 2.Rg5#
      • 1...Rf4
        • 2.Rxc5#
      • 1...Rg4
        • 2.Rxc5#
      • 1...Qh4+!
    • 1.Rg5+?
      • 1...Kd6
        • 2.Ra6#
      • 1...Kxe6
        • 2.Ra6#
      • 1...Kf6!
    • 1.Qxe4+?
      • 1...Kd6
        • 2.Ra6#
      • 1...Rxe4!
  • Keys
    • 1.Sxc5!
      • threat
        • 2.Sd3#
      • 1...Kf4+
        • 2.Qxe4#
      • 1...Kd5+
        • 2.Sxe4#
      • 1...Kf5+
        • 2.Se6#
      • 1...Rxc3
        • 2.Sb3#
      • 1...Rd3
        • 2.Sxd3#
        • 2.Sd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(f);N_GUARD,P-FLIGHT,P_PINS(G),P_SPINR(d)::R(E),XP(e)
  • Tries
    • Try
      • K(I);P-FLIGHT
      • Threat
        • DUALS(2)
      • Vars
        • K(f);P-FLIGHT,P_PINS(G)::R1(E),XP(e)
        • Q(a);XB(B)::R(H)
        • R(b);XP(D)::R(E),XP(e)
        • Q(a);::R(E),XP(e)
        • R(b);::R(H)
        • R(d);::R(H)
        • R(d);::R(E),XP(e)
      • Refutation
        • Q(a);CHECK
    • Try
      • R(H);CHECK
      • Vars
        • K(f);N_GUARD,N_SPINP(e),P_PINS(G),S_FLIGHT::R(E)
        • K(f);N_GUARD,N_SPINP(e),P-FLIGHT,XS(G)::R(E)
      • Refutation
        • K(f);N_SPINP(e),P_PINS(G),S_FLIGHT
    • Try
      • Q(A);CHECK,XR(d)
      • Vars
        • K(f);N_SPINP(e),S_CUTR(b),S_FLIGHT::R(E)
      • Refutation
        • R(b);XQ(A)
  • Actual
    • S(G);XP(e)
    • Threat
      • R(E)+S(G),DCHECK
    • Vars
      • K(f);CHECK,P_SPINR(b),S_FLIGHT::QAR1(A),XR(d)
      • K(f);CHECK,N_GUARD,P-FLIGHT::R(E)+S(G),XR(d)
      • K(f);CHECK,N_GUARD,P-FLIGHT,P_SPINR(d)::R(E)+S(G)
      • R(b);XP(C)::R(E)+S(G)
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