MESON Chess Problem Database

Problem Display
PID: 151696 (1r2R1b1/Pn4P1/4P1PN/3qkNBR/BP1pp3/2P1p1K1/8/b2Q4 w - - 0 1)

Albarda, Johannes

Jaarboek, 1961

1r2R1b1/Pn4P1/4P1PN/3qkNBR/BP1pp3/2P1p1K1/8/b2Q4

#2

14 + 9

15148 Sadier Collection 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Qa2
      • 2.Qxd4#
    • 1...Qb3
      • 2.Qxd4#
    • 1...Qc6
      • 2.Qxd4#
    • 1...Qxe6
      • 2.Qxd4#
    • 1...Qa5
      • 2.Qxd4#
    • 1...Qb5
      • 2.Qxd4#
  • Tries
    • 1.Be7?
      • threat
        • 2.Sxd4#
      • 1...Kxe6
        • 2.Bd8#
      • 1...Qxe6
        • 2.Qxd4#
      • 1...Bxe6
        • 2.Sg4#
      • 1...dxc3
        • 2.Sd4#
      • 1...d3
        • 2.Sd4#
      • 1...Sd6!
    • 1.axb8Q+?
      • 1...Qd6
        • 2.Qxd4#
      • 1...Sd6!
    • 1.axb8B+?
      • 1...Qd6
        • 2.Qxd4#
      • 1...Sd6!
  • Keys
    • 1.Sxd4!
      • threat
        • 2.Be7#
      • 1...Kd6
        • 2.axb8Q#
        • 2.axb8B#
      • 1...Qxe6
        • 2.Sc6#
      • 1...Qxd4
        • 2.Qxd4#
      • 1...Bxe6
        • 2.Sf7#
      • 1...Sd6
        • 2.Sg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • Q(e);N_GUARD::QAB1(A),XP(c)
    • Q(e);N_GUARD,P_SPINQ(e),XP(I)::QAB1(A),XP(c)
  • Tries
    • Try
      • B(G);
      • Threat
        • R(H)+S(F),XP(c)
      • Vars
        • K(f);OGATEB,P-FLIGHT,XP(I)::R(N)+B(G)
        • Q(e);N_GUARD,SBLOCK,XP(I)::QAB1(A),XP(c)
        • B(i);SBLOCK,XP(I)::S(K)
        • P(c);XP(B)::R(H)+S(F)
        • P(c);::R(H)+S(F)
      • Refutation
        • S(g);
    • Try
      • P(L);CHECK,XR(h)
      • Vars
        • Q(e);P_SPINQ(e)::QAB1(A),XP(c)
      • Refutation
        • S(g);P_SPINS(g)
    • Try
      • P(L);CHECK,XR(h)
      • Vars
        • Q(e);P_SPINQ(e)::QAB1(A),XP(c)
      • Refutation
        • S(g);P_SPINS(g)
  • Actual
    • S(F);XP(c)
    • Threat
      • R(H)+B(G)
    • Vars
      • K(f);S_FLIGHT::PXR(h)=Q
      • Q(e);N_GUARD,P_SPINQ(e),XP(I)::S(F)
      • Q(e);OGATE,XS(F)::QAB1(A),XQ(e)
      • B(i);N_GUARD,P_SPINB(i),XP(I)::S(K)
      • S(g);SBLOCK::S(K)
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