MESON Chess Problem Database

Problem Display
PID: 7918 (nK6/rp6/k2N4/1p6/1P6/8/8/7Q w - - 0 1)

Ivanov, Bernard

The Problemist, 1994

nK6/rp6/k2N4/1p6/1P6/8/8/7Q

#2

4 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...b6
      • 2.Qa1#
  • Tries
    • 1.Se4?
      • 1...Kb6
        • 2.Qh6#
      • 1...Sb6
        • 2.Sc5#
      • 1...b6
        • 2.Qa1#
      • 1...Sc7!
    • 1.Se8?
      • 1...Kb6
        • 2.Qh6#
      • 1...Sb6
        • 2.Sc7#
      • 1...b6
        • 2.Qa1#
      • 1...Sc7!
    • 1.Qd5?
      • threat
        • 2.Qxb5#
      • 1...Kb6
        • 2.Qxb5#
      • 1...Sc7!
    • 1.Qc6+?
      • 1...Sb6
        • 2.Qxb5#
      • 1...b6
        • 2.Qxb5#
      • 1...bxc6!
    • 1.Qf1?
      • threat
        • 2.Qxb5#
      • 1...Kb6
        • 2.Qxb5#
      • 1...Sc7!
    • 1.Qg1?
      • threat
        • 2.Qxa7#
      • 1...b6
        • 2.Qa1#
      • 1...Sb6!
    • 1.Qh5?
      • threat
        • 2.Qxb5#
      • 1...Kb6
        • 2.Qxb5#
      • 1...Sc7!
  • Keys
    • 1.Sxb7!
      • 1...Rxb7+
        • 2.Qxb7#
      • 1...Kb6
        • 2.Qh6#
      • 1...Sb6
        • 2.Sc5#
      • 1...Sc7
        • 2.Qc6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • P(d);SBLOCK::QAR(A)
  • Tries
    • Try
      • S(C);
      • Vars
        • K(b);P-FLIGHT::QAR(A)
        • S(e);SBLOCK::S(C)
        • P(d);SBLOCK::QAR(A)
      • Refutation
        • S(e);
    • Try
      • S(C);
      • Vars
        • K(b);P-FLIGHT::QAR(A)
        • S(e);N_GUARD,SBLOCK::S(C)
        • P(d);SBLOCK::QAR(A)
      • Refutation
        • S(e);
    • Try
      • Q(A);
      • Threat
        • QAB1(A),XP(a)
      • Vars
        • K(b);P-FLIGHT::QAR1(A),XP(a)
      • Refutation
        • S(e);
    • Try
      • Q(A);CHECK
      • Vars
        • S(e);P_SPINS(e)::QAB1(A),XP(a)
        • P(d);P_SPINP(d)::QAB1(A),XP(a)
      • Refutation
        • P(d);XQ(A)
    • Try
      • Q(A);P_PINP(a)
      • Threat
        • QAB1(A),XP(a)
      • Vars
        • K(b);N_SPINP(a),P-FLIGHT::QAR1(A),XP(a)
      • Refutation
        • S(e);
    • Try
      • Q(A);
      • Threat
        • QAR1(A),XR(c)
      • Vars
        • P(d);SBLOCK::QAR(A)
      • Refutation
        • S(e);
    • Try
      • Q(A);
      • Threat
        • QAB1(A),XP(a)
      • Vars
        • K(b);P-FLIGHT::QAR1(A),XP(a)
      • Refutation
        • S(e);
  • Actual
    • S(C);XP(d)
    • Vars
      • R(c);CHECK,OGATE,XS(C)::QAB1(A),XR(c)
      • K(b);P-FLIGHT::QAR(A)
      • S(e);SBLOCK::S(C)
      • S(e);N_GUARD::QAR2(A)
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