MESON Chess Problem Database

Problem Display
PID: 107595 (K2B3R/PP1k1PP1/1P1q4/1P1N1PpB/4Nn2/8/8/8 w - - 0 1)

Armeni, Alberto

Canadian Chess Championship, 1980

K2B3R/PP1k1PP1/1P1q4/1P1N1PpB/4Nn2/8/8/8

#2

13 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qa3
      • 2.Sdf6#
    • 1...Qb4
      • 2.Sdf6#
    • 1...Qc5
      • 2.Sdf6#
    • 1...Qc7
      • 2.Sdf6#
    • 1...Qb8+
      • 2.axb8S#
    • 1...Qxb6
      • 2.Sxb6#
    • 1...Qf6
      • 2.Sdxf6#
    • 1...Se6
      • 2.Sef6#
      • 2.Sdf6#
  • Tries
    • 1.Bf6?
      • threat
        • 2.Rd8#
      • 1...Qb8+
        • 2.axb8S#
      • 1...Qf8+
        • 2.gxf8S#
      • 1...Qxb6
        • 2.f8S#
      • 1...Qxf6
        • 2.b8S#
      • 1...Qc7
        • 2.f8S#
      • 1...Qe7
        • 2.b8S#
      • 1...Se6!
    • 1.b8S+?
      • 1...Kc8
        • 2.Sxd6#
        • 2.b7#
      • 1...Qxb8+!
    • 1.f8Q?
      • threat
        • 2.Qxd6#
        • 2.Qe8#
      • 1...Qb8+
        • 2.axb8S#
      • 1...Qxd5
        • 2.Sf6#
        • 2.Qe7#
        • 2.Qe8#
      • 1...Qxb6
        • 2.Sxb6#
        • 2.Qe7#
        • 2.Qf7#
        • 2.Qe8#
      • 1...Qa3
        • 2.Sef6#
        • 2.Sdf6#
        • 2.Qe8#
      • 1...Qb4
        • 2.Sef6#
        • 2.Sdf6#
        • 2.Qe8#
      • 1...Qc5
        • 2.Sxc5#
        • 2.Sef6#
        • 2.Sdf6#
        • 2.Qe8#
      • 1...Qe5
        • 2.Sc5#
      • 1...Qc7
        • 2.Sef6#
        • 2.Sdf6#
        • 2.Qe7#
        • 2.Qf7#
        • 2.Qe8#
      • 1...Qe7
        • 2.Qxe7#
      • 1...Qc6
        • 2.Qe7#
        • 2.Qf7#
        • 2.Qe8#
      • 1...Qe6
        • 2.Sc5#
      • 1...Qf6
        • 2.Sc5#
        • 2.Sexf6#
        • 2.Sdxf6#
        • 2.Qe8#
      • 1...Qg6
        • 2.Sc5#
        • 2.Qe7#
      • 1...Qh6
        • 2.Sc5#
        • 2.Qe7#
        • 2.Qf7#
        • 2.Qe8#
      • 1...Qxf8!
  • Keys
    • 1.Bxg5!
      • threat
        • 2.Rd8#
      • 1...Qb8+
        • 2.axb8S#
      • 1...Qf8+
        • 2.gxf8S#
      • 1...Qxb6
        • 2.f8S#
      • 1...Qc7
        • 2.f8S#
      • 1...Qe7
        • 2.b8S#
      • 1...Qf6
        • 2.b8S#
      • 1...Se6
        • 2.Sef6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • Q(c);N_GUARD,P_PINP(G)::S(C)
    • Q(c);N_GUARD::S(C)
    • Q(c);CHECK,OGATE::PXQ(c)=S
    • Q(c);XP(F)::S(C),XQ(c)
    • Q(c);N_GUARD::S(C),XQ(c)
  • Tries
    • Try
      • B(L);
      • Threat
        • R1(M)
      • Vars
        • Q(c);CHECK,OGATE::PXQ(c)=S
        • Q(c);N_GUARD,XP(F)::P=S
        • Q(c);N_GUARD,XB(L)::P=S
        • Q(c);N_GUARD::P=S
      • Refutation
        • S(a);
    • Try
      • P(H);CHECK
      • Refutation
        • Q(c);CHECK,XS(H)
    • Try
      • P(I);
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);CHECK,OGATE::PXQ(c)=S
        • Q(c);N_GUARD::S(A)
        • Q(c);N_GUARD::QAR1(I),XQ(c)
      • Refutation
        • Q(c);P_PINB(L),XQ(I)
  • Actual
    • B(L);XP(b)
    • Threat
      • R1(M)
    • Vars
      • Q(c);CHECK,OGATE::PXQ(c)=S
      • Q(c);N_GUARD,XP(F)::P=S
      • Q(c);N_GUARD::P=S
      • S(a);S_CUTQ(c)::S(A)
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