MESON Chess Problem Database

Problem Display
PID: 11418 (2nbB3/RP1pkNPn/2qNP3/2P2Pp1/4p3/B7/1Q6/1K6 w - - 0 1)

Froberg, Johan Hilding Laurentius

Problemschack, 1938

2nbB3/RP1pkNPn/2qNP3/2P2Pp1/4p3/B7/1Q6/1K6

#2

12 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qa4
      • 2.bxc8S#
    • 1...Qb5
      • 2.bxc8S#
    • 1...Qd5
      • 2.bxc8S#
    • 1...Qb6
      • 2.bxc8S#
    • 1...Bc7
      • 2.bxc8S#
    • 1...Sf8
      • 2.g8S#
    • 1...dxe6
      • 2.bxc8S#
  • Tries
    • 1.f6+?
      • 1...Kxe6
        • 2.Qe5#
      • 1...Sxf6!
  • Keys
    • 1.exd7!
      • threat
        • 2.Qe5#
      • 1...Qxb7
        • 2.dxc8S#
      • 1...Qxd7
        • 2.bxc8S#
      • 1...Qxc5
        • 2.Sxc8#
      • 1...Qxd6
        • 2.bxc8S#
      • 1...Qb5
        • 2.Sxc8#
        • 2.bxc8S#
        • 2.dxc8S#
      • 1...Qd5
        • 2.Sxc8#
        • 2.bxc8S#
        • 2.dxc8S#
      • 1...Qb6
        • 2.Sxc8#
        • 2.bxc8S#
        • 2.dxc8S#
      • 1...Sf8
        • 2.g8S#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 6
  • Sets
    • Q(c);N_GUARD::PXS(g)=S
    • Q(c);N_GUARD,P_PINQ(B)::PXS(g)=S
    • B(h);S_CUTQ(c)::PXS(g)=S
    • S(f);SBLOCK::P=S
    • P(d);XP(G)::PXS(g)=S
  • Tries
    • Try
      • P(E);CHECK
      • Vars
        • K(e);P-FLIGHT,XP(G)::QAR1(B)
      • Refutation
        • S(f);XP(E)
  • Actual
    • P(G);XP(d)
    • Threat
      • QAR2(B)
    • Vars
      • Q(c);N_GUARD,P_PINQ(B),XP(I)::PXS(g)=S
      • Q(c);N_GUARD,XP(G)::PXS(g)=S
      • Q(c);N_GUARD,XP(D)::S(F),XS(g)
      • Q(c);N_GUARD,XS(F)::PXS(g)=S
      • S(f);SBLOCK::P=S
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