MESON Chess Problem Database

Problem Display
PID: 134355 (1Nq1nn2/1Ppb2R1/2pkNPQ1/5P2/1PPB4/2P1p3/4K2b/3R4 w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

The Problemist, 2009

1Nq1nn2/1Ppb2R1/2pkNPQ1/5P2/1PPB4/2P1p3/4K2b/3R4

#2

13 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Bg1
      • 2.Qg3#
    • 1...Bg3
      • 2.Qxg3#
    • 1...Be5
      • 2.Bc5#
    • 1...Sxf6
      • 2.Bxf6#
    • 1...c5
      • 2.bxc5#
  • Tries
    • 1.Sg5?
      • threat
        • 2.Se4#
        • 2.Sf7#
      • 1...Sxf6
        • 2.Se4#
        • 2.Bxf6#
      • 1...Be6
        • 2.Se4#
      • 1...Bxf5!
    • 1.Rxd7+?
      • 1...Sxd7
        • 2.bxc8S#
      • 1...Qxd7!
    • 1.Qg2?
      • threat
        • 2.Qxh2#
        • 2.c5#
      • 1...Bg1
        • 2.Qg3#
        • 2.c5#
      • 1...Bg3
        • 2.Qxg3#
        • 2.c5#
      • 1...Bf4
        • 2.c5#
      • 1...Be5
        • 2.Bc5#
        • 2.c5#
      • 1...Sg6
        • 2.c5#
      • 1...c5
        • 2.Qd5#
        • 2.Qxh2#
        • 2.bxc5#
      • 1...Sxe6!
  • Keys
    • 1.f7!
      • threat
        • 2.Bf6#
      • 1...Ke7
        • 2.fxe8S#
      • 1...Bxe6
        • 2.bxc8S#
      • 1...Sxe6
        • 2.f8Q#
        • 2.f8B#
      • 1...Be5
        • 2.Bc5#
      • 1...Sf6
        • 2.Bxf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • B(a);N_GUARD::QAB(J)
    • B(a);N_GUARD::QAB(J),XB(a)
    • B(a);SBLOCK::R(A)+B(F),DCHECK
    • S(h);OGATE,XP(I)::R(A)+B(F),XS(h)
    • P(c);OGATE::P(D),XP(c)
  • Tries
    • Try
      • S(H);
      • Threat
        • DUALS(2)
      • Vars
        • B(f);::S(H)
      • Refutation
        • B(f);XP(G)
    • Try
      • R(L);CHECK,XB(f)
      • Vars
        • S(i);N_GUARD,XR(L)::PXQ(g)=S
      • Refutation
        • Q(g);XR(L)
    • Try
      • Q(J);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);::P(E)
        • S(i);::P(E)
      • Refutation
        • S(i);XS(H)
  • Actual
    • P(I);
    • Threat
      • R(A)+B(F)
    • Vars
      • K(d);S_FLIGHT::PXS(h)=S
      • B(f);N_GUARD,P_SPINB(f),XS(H)::PXQ(g)=S
      • S(i);OGATE,P_SPINS(i),XS(H)::P=Q
      • B(a);SBLOCK::R(A)+B(F),DCHECK
      • S(h);::R(A)+B(F),XS(h)
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