MESON Chess Problem Database

Problem Display
PID: 160152 (1q3R2/1b1P4/1p2p3/3PkN1N/5p2/7K/2BP4/bQ6 w - - 0 1)

Lincoln, Robert A

Chess Life, 1990

1q3R2/1b1P4/1p2p3/3PkN1N/5p2/7K/2BP4/bQ6

#2

9 + 7

15148 Sadier Collection 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd5
      • 2.Qb5#
    • 1...Bxd5
      • 2.Qxa1#
    • 1...exd5
      • 2.Qe1#
  • Tries
    • 1.Qb2+?
      • 1...Kxd5
        • 2.Qb5#
      • 1...Bxb2!
    • 1.Qxb6?
      • threat
        • 2.Qxe6#
      • 1...Kxd5
        • 2.Qb5#
      • 1...Bxd5
        • 2.Qxb8#
      • 1...exd5
        • 2.Qf6#
      • 1...exf5
        • 2.Rxf5#
      • 1...Qd6
        • 2.Qxd6#
      • 1...Qe8
        • 2.Qd6#
      • 1...Bc6!
    • 1.d4+?
      • 1...Kxd5
        • 2.Qb5#
      • 1...Bxd4!
  • Keys
    • 1.Qb4!
      • threat
        • 2.Qe4#
      • 1...Kxd5
        • 2.Qb5#
      • 1...Bxd5
        • 2.Qxf4#
      • 1...exd5
        • 2.Qe7#
      • 1...exf5
        • 2.Rxf5#
      • 1...Bd4
        • 2.Qxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(c);OGATEB,P-FLIGHT,XP(E)::QAR2(A)
    • B(f);SBLOCK,XP(E)::QAB(A),XB(a)
    • P(e);SBLOCK,XP(E)::QAR(A)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • K(c);OGATEB,P-FLIGHT,XP(E)::QAR2(A)
      • Refutation
        • B(a);XQ(A)
    • Try
      • Q(A);XP(d)
      • Threat
        • QAR1(A),XP(e)
      • Vars
        • K(c);OGATEB,P-FLIGHT,XP(E)::QAR2(A)
        • B(f);OGATE,SBLOCK,XP(E)::QAB(A),XQ(g)
        • P(e);OGATE,SBLOCK,XP(E)::QAB1(A)
        • P(e);OGATE,XS(F)::R1(I),XP(e)
        • Q(g);N_GUARD::QAB1(A),XQ(g)
        • Q(g);N_GUARD::QAB1(A)
      • Refutation
        • B(f);
    • Try
      • P(C);CHECK
      • Vars
        • K(c);P-FLIGHT,XP(E)::QAR2(A)
      • Refutation
        • B(a);XP(C)
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • K(c);OGATEB,P-FLIGHT,XP(E)::QAR2(A)
      • B(f);SBLOCK,XP(E)::QAB1(A),XP(b)
      • P(e);OGATEB,SBLOCK,XP(E)::QAR2(A)
      • P(e);OGATE,XS(F)::R1(I),XP(e)
      • B(a);N_GUARD::QAB1(A),XB(a)
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