MESON Chess Problem Database

Problem Display
PID: 51759 (1qk5/1N3Q2/3B4/8/3N4/8/8/6K1 w - - 0 1)

Neyndorff, Luke

StrateGems, 2004

1qk5/1N3Q2/3B4/8/3N4/8/8/6K1

#2

5 + 2

SOLUTION

  • SOUND
  • Sets
    • 1...Qa7
      • 2.Qc7#
    • 1...Qc7
      • 2.Qxc7#
    • 1...Qxb7
      • 2.Qe8#
    • 1...Qa8
      • 2.Qc7#
  • Tries
    • 1.Kf1?
      • 1...Qxb7
        • 2.Qe8#
      • 1...Qc7
        • 2.Qxc7#
      • 1...Qa7
        • 2.Qc7#
      • 1...Qa8
        • 2.Qc7#
      • 1...Qxd6!
    • 1.Kf2?
      • 1...Qxb7
        • 2.Qe8#
      • 1...Qc7
        • 2.Qxc7#
      • 1...Qa7
        • 2.Qc7#
      • 1...Qa8
        • 2.Qc7#
      • 1...Qxd6!
    • 1.Kh2?
      • 1...Qxb7
        • 2.Qe8#
      • 1...Qc7
        • 2.Qxc7#
      • 1...Qa7
        • 2.Qc7#
      • 1...Qa8
        • 2.Qc7#
      • 1...Qxd6+!
    • 1.Sb5?
      • 1...Qa7+
        • 2.Sxa7#
      • 1...Qxb7
        • 2.Qe8#
      • 1...Qc7
        • 2.Qxc7#
      • 1...Qa8
        • 2.Qc7#
      • 1...Qxd6!
    • 1.Qc4+?
      • 1...Kd7
        • 2.Qe6#
        • 2.Qc6#
      • 1...Qc7
        • 2.Qxc7#
      • 1...Kxb7!
    • 1.Qg8+?
      • 1...Kd7
        • 2.Qe6#
      • 1...Kxb7!
    • 1.Qe7?
      • 1...Qxb7
        • 2.Qe8#
      • 1...Qc7
        • 2.Qxc7#
      • 1...Qa7
        • 2.Qc7#
      • 1...Qa8
        • 2.Qc7#
      • 1...Qxd6!
    • 1.Qf8+?
      • 1...Kd7
        • 2.Sc5#
      • 1...Kxb7!
  • Keys
    • 1.Sc6!
      • 1...Qa7+
        • 2.Sxa7#
      • 1...Qxd6
        • 2.Sxd6#
      • 1...Qxb7
        • 2.Qe8#
      • 1...Qc7
        • 2.Qxc7#
      • 1...Qa8
        • 2.Qc7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • Q(a);N_GUARD,P_PINS(B)::QAR1(E)
    • Q(a);N_GUARD::QAR1(E),XQ(a)
    • Q(a);SBLOCK,XS(D)::QAR2(E)
    • Q(a);N_GUARD::QAR1(E)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Vars
        • Q(a);SBLOCK,XS(D)::QAR2(E)
        • Q(a);N_GUARD::QAR1(E),XQ(a)
        • Q(a);N_GUARD::QAR1(E)
      • Refutation
        • Q(a);XB(C)
    • Try
      • K(A);S_FLIGHT
      • Vars
        • Q(a);SBLOCK,XS(D)::QAR2(E)
        • Q(a);N_GUARD::QAR1(E),XQ(a)
        • Q(a);N_GUARD,P_PINS(B)::QAR1(E)
        • Q(a);N_GUARD::QAR1(E)
      • Refutation
        • Q(a);XB(C)
    • Try
      • K(A);P_SPINB(C),S_FLIGHT
      • Vars
        • Q(a);N_PINB(C),SBLOCK,XS(D)::QAR2(E)
        • Q(a);N_GUARD::QAR1(E),XQ(a)
        • Q(a);N_GUARD,N_PINB(C)::QAR1(E)
      • Refutation
        • Q(a);CHECK,XB(C)
    • Try
      • S(B);
      • Vars
        • Q(a);CHECK,N_GUARD::S(B),XQ(a)
        • Q(a);SBLOCK,XS(D)::QAR2(E)
        • Q(a);N_GUARD::QAR1(E),XQ(a)
        • Q(a);N_GUARD::QAR1(E)
      • Refutation
        • Q(a);XB(C)
    • Try
      • Q(E);CHECK
      • Vars
        • Q(a);N_GUARD,P_SPINQ(a)::QAR1(E),XQ(a)
      • Refutation
        • K(b);S_FLIGHT,XS(D)
    • Try
      • Q(E);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB1(E)
      • Refutation
        • K(b);S_FLIGHT,XS(D)
    • Try
      • Q(E);
      • Vars
        • Q(a);SBLOCK,XS(D)::QAR2(E)
        • Q(a);N_GUARD::QAR1(E),XQ(a)
        • Q(a);N_GUARD,P_PINS(B)::QAR1(E)
        • Q(a);N_GUARD::QAR1(E)
      • Refutation
        • Q(a);XB(C)
    • Try
      • Q(E);CHECK
      • Vars
        • K(b);S_FLIGHT::S(D)
      • Refutation
        • K(b);S_FLIGHT,XS(D)
  • Actual
    • S(B);
    • Vars
      • Q(a);CHECK,N_GUARD::S(B),XQ(a)
      • Q(a);XB(C)::S(D),XQ(a)
      • Q(a);SBLOCK,XS(D)::QAR2(E)
      • Q(a);N_GUARD::QAR1(E),XQ(a)
      • Q(a);N_GUARD::QAR1(E)
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