MESON Chess Problem Database

Problem Display
PID: 255971 (b7/2pR1q2/5n1Q/N2P1p2/RBBk1n2/3p1P2/K2P4/8 w - - 0 1)

Back, Par-Erik

Schackvarlden, 1936

b7/2pR1q2/5n1Q/N2P1p2/RBBk1n2/3p1P2/K2P4/8

#2

10 + 8

15601 Albrecht-Leiss-Degener Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ke5
      • 2.Bc3#
    • 1...Qxd5
      • 2.Qxf6#
    • 1...Qh5
      • 2.Qxf6#
    • 1...Qg8
      • 2.Qxf6#
    • 1...Qxd7
      • 2.Qxf6#
    • 1...Qh7
      • 2.Qxf6#
    • 1...Se2
      • 2.Qe3#
    • 1...Sh3
      • 2.Qe3#
    • 1...S4xd5
      • 2.Qe3#
    • 1...S4h5
      • 2.Qe3#
    • 1...Se6
      • 2.Qe3#
    • 1...Sg6
      • 2.Qe3#
    • 1...Sg4
      • 2.Qxf4#
    • 1...S6xd5
      • 2.Qxf4#
    • 1...Sxd7
      • 2.Qxf4#
    • 1...Sh7
      • 2.Qxf4#
    • 1...Se8
      • 2.Qxf4#
    • 1...Sg8
      • 2.Qxf4#
    • 1...c5
      • 2.Bc3#
  • Tries
    • 1.Sb3+?
      • 1...Ke5
        • 2.Bc3#
      • 1...Kxc4!
    • 1.Bd6?
      • threat
        • 2.Sb3#
        • 2.Bb3#
      • 1...Qxd5
        • 2.Sb3#
      • 1...Qxd7
        • 2.Sb3#
        • 2.Qxf6#
      • 1...Bxd5
        • 2.Sb3#
      • 1...S4xd5
        • 2.Sb3#
      • 1...S6xd5
        • 2.Sb3#
      • 1...Bc6
        • 2.Sb3#
        • 2.Sxc6#
      • 1...c5
        • 2.Sb3#
      • 1...cxd6!
  • Keys
    • 1.Bb3!
      • threat
        • 2.Bd6#
      • 1...Ke5
        • 2.Bc3#
      • 1...Qxd5
        • 2.Qxf6#
      • 1...Qxd7
        • 2.Qxf6#
      • 1...Bxd5
        • 2.Sc6#
      • 1...S4xd5
        • 2.Qe3#
      • 1...S6xd5
        • 2.Qxf4#
      • 1...Bc6
        • 2.Sxc6#
      • 1...c5
        • 2.Bc3#

This is a version

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 13
  • Sets
    • K(b);N_GUARD,S_FLIGHT::B(E)
    • Q(g);N_GUARD,P_PINB(F),P_SPINQ(g),XP(H)::QAB(I),XS(e)
    • Q(g);N_GUARD::QAB(I),XS(e)
    • Q(g);N_GUARD,XR(J)::QAB(I),XS(e)
    • S(c);OGATE::QAB1(I)
    • S(c);OGATE,P_SPINS(c),XP(H)::QAB1(I)
    • S(e);N_GUARD::QAR2(I),XS(c)
    • S(e);N_GUARD,P_SPINS(e),XP(H)::QAR2(I),XS(c)
    • S(e);N_GUARD,XR(J)::QAR2(I),XS(c)
    • P(f);SBLOCK::B(E)
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • K(b);S_FLIGHT::B(E)
      • Refutation
        • K(b);P-FLIGHT,XB(F)
    • Try
      • B(E);
      • Threat
        • DUALS(2)
      • Vars
        • Q(g);P_PINB(F),XP(H)::S(G)
        • B(h);P_PINB(F),XP(H)::S(G)
        • S(c);XP(H)::S(G)
        • S(e);XP(H)::S(G)
        • P(f);::S(G)
      • Refutation
        • P(f);XB(E)
  • Actual
    • B(F);
    • Threat
      • R(D)+B(E)
    • Vars
      • K(b);N_GUARD,S_FLIGHT::B(E)
      • Q(g);N_GUARD,P_PINB(F),P_SPINQ(g),XP(H)::QAB(I),XS(e)
      • Q(g);N_GUARD,XR(J)::QAB(I),XS(e)
      • B(h);N_GUARD,P_PINB(F),P_SPINB(h),XP(H)::S(G)
      • S(c);OGATE,P_SPINS(c),XP(H)::QAB1(I)
      • S(e);N_GUARD,P_SPINS(e),XP(H)::QAR2(I),XS(c)
      • B(h);N_GUARD::S(G),XB(h)
      • P(f);SBLOCK::R(D)+B(E),DCHECK
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