MESON Chess Problem Database

Problem Display
PID: 219457 (8/n7/8/8/2QN4/k7/8/K2b4 w - - 0 1)

Vaughan, Colin V

Schach-Report, 1990

8/n7/8/8/2QN4/k7/8/K2b4

#2

3 + 3

3713 Snap 2020
6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bc2
      • 2.Sxc2#
    • 1...Be2
      • 2.Sc2#
      • 2.Qb3#
    • 1...Bb3
      • 2.Qxb3#
    • 1...Bf3
      • 2.Sc2#
      • 2.Qb3#
    • 1...Ba4
      • 2.Qc5#
    • 1...Bg4
      • 2.Sc2#
      • 2.Qb3#
    • 1...Bh5
      • 2.Sc2#
      • 2.Qb3#
    • 1...Sb5
      • 2.Sxb5#
    • 1...Sc6
      • 2.Sb5#
    • 1...Sc8
      • 2.Sb5#
  • Tries
    • 1.Sc6?
      • threat
        • 2.Qa2#
        • 2.Qb4#
      • 1...Bb3
        • 2.Qb4#
      • 1...Sxc6!
    • 1.Qa6+?
      • 1...Ba4
        • 2.Qd6#
      • 1...Kb4!
    • 1.Qc3+?
      • 1...Bb3
        • 2.Qxb3#
      • 1...Ka4!
  • Keys
    • 1.Kb1!
      • 1...Bc2+
        • 2.Sxc2#
      • 1...Be2
        • 2.Sc2#
        • 2.Qb3#
      • 1...Bb3
        • 2.Qxb3#
      • 1...Bf3
        • 2.Sc2#
        • 2.Qb3#
      • 1...Ba4
        • 2.Qc5#
      • 1...Bg4
        • 2.Sc2#
        • 2.Qb3#
      • 1...Bh5
        • 2.Sc2#
        • 2.Qb3#
      • 1...Sb5
        • 2.Sxb5#
      • 1...Sc6
        • 2.Sb5#
      • 1...Sc8
        • 2.Sb5#

This anticipates 172295(1996)

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • B(a);N_GUARD::S(C),XB(a)
    • B(a);N_GUARD::QAR1(B),XB(a)
    • B(a);SBLOCK::QAB(B)
    • S(c);N_GUARD::S(C),XS(c)
    • S(c);N_GUARD::S(C)
  • Tries
    • Try
      • S(C);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);::QAB1(B)
      • Refutation
        • S(c);XS(C)
    • Try
      • Q(B);CHECK
      • Vars
        • B(a);P_SPINB(a),SBLOCK::QAB(B)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • B(a);N_GUARD,P_SPINB(a)::QAR1(B),XB(a)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • K(A);P-FLIGHT
    • Vars
      • B(a);CHECK,N_GUARD::S(C),XB(a)
      • B(a);N_GUARD::QAR1(B),XB(a)
      • B(a);SBLOCK::QAB(B)
      • S(c);N_GUARD::S(C),XS(c)
      • S(c);N_GUARD::S(C)
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