MESON Chess Problem Database

Problem Display
PID: 69355 (6b1/B1K2R2/4p3/3N4/1Q1pkPB1/1n2P3/1N5n/8 w - - 0 1)

Ellerman, Arnoldo

Chess Life, 1968

6b1/B1K2R2/4p3/3N4/1Q1pkPB1/1n2P3/1N5n/8

#2

9 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd5
      • 2.Qb7#
    • 1...Sa1
      • 2.Qxd4#
    • 1...Sc1
      • 2.Qxd4#
    • 1...Sd2
      • 2.Qxd4#
    • 1...Sa5
      • 2.Qxd4#
    • 1...Sc5
      • 2.Qxd4#
    • 1...exd5
      • 2.Qe7#
  • Tries
    • 1.Bxd4?
      • threat
        • 2.Sc3#
        • 2.Sf6#
      • 1...Kxd5
        • 2.Qb7#
      • 1...Sxd4
        • 2.Qxd4#
      • 1...exd5
        • 2.Qe7#
      • 1...Sxg4!
    • 1.Qc3?
      • threat
        • 2.Sf6#
      • 1...Kxd5
        • 2.Qc6#
      • 1...dxe3
        • 2.Qe5#
        • 2.Qd3#
      • 1...exd5
        • 2.Qd3#
      • 1...Sxg4!
    • 1.Qxb3?
      • threat
        • 2.Sf6#
      • 1...dxe3
        • 2.Sc3#
        • 2.Qc4#
        • 2.Qd3#
      • 1...exd5
        • 2.Qd3#
      • 1...Sxg4!
  • Keys
    • 1.Qe1!
      • threat
        • 2.Sf6#
      • 1...Kxd5
        • 2.e4#
      • 1...Sxg4
        • 2.Qh1#
      • 1...dxe3
        • 2.Sc3#
      • 1...exd5
        • 2.exd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • K(d);N_SPINP(c),OGATEB,S_FLIGHT,XS(F)::QAB(C)
    • S(b);N_GUARD::QAR1(C),XP(c)
    • P(e);OGATEB,SBLOCK,XS(F)::QAR(C)
  • Tries
    • Try
      • B(G);XP(c)
      • Threat
        • DUALS(2)
      • Vars
        • K(d);OGATEB,S_FLIGHT,XS(F)::QAB(C)
        • S(b);OGATE,P_SPINS(b),XB(G)::QAR1(C),XS(b)
        • P(e);OGATEB,SBLOCK,XS(F)::QAR(C)
      • Refutation
        • S(a);XB(E)
    • Try
      • Q(C);N_PINP(c)
      • Threat
        • S(F)
      • Vars
        • K(d);OGATEB,S_FLIGHT,XS(F)::QAB1(C)
        • P(e);SBLOCK,XS(F)::QAB1(C)
      • Refutation
        • S(a);XB(E)
    • Try
      • Q(C);N_PINP(c),XS(b)
      • Threat
        • S(F)
      • Vars
        • P(e);SBLOCK,XS(F)::QAB1(C)
      • Refutation
        • S(a);XB(E)
  • Actual
    • Q(C);N_PINP(c)
    • Threat
      • S(F)
    • Vars
      • K(d);OGATE,S_FLIGHT,XS(F)::P(B)
      • S(a);N_GUARD,XB(E)::QAB(C)
      • P(c);N_GUARD,P_SPINP(c),XP(B)::S(F)
      • P(e);SBLOCK,XS(F)::QAR(C)+P(B),XP(c)
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