MESON Chess Problem Database

Problem Display
PID: 244328 (8/8/8/8/6Np/7K/3Qp3/5k2 w - - 0 1)

McDowell, Michael

The Problemist, 1989

8/8/8/8/6Np/7K/3Qp3/5k2

#2

3 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Kg1
      • 2.Qe1#
    • 1...e1Q
      • 2.Qg2#
    • 1...e1S
      • 2.Qf2#
    • 1...e1B
      • 2.Qg2#
    • 1...e1R
      • 2.Qf2#
      • 2.Qg2#
  • Tries
    • 1.Kh2?
      • 1...e1Q
        • 2.Qg2#
      • 1...e1S
        • 2.Se3#
        • 2.Qf2#
      • 1...e1B
        • 2.Se3#
        • 2.Qg2#
        • 2.Qd3#
      • 1...e1R
        • 2.Qf2#
        • 2.Qg2#
      • 1...h3!
    • 1.Sh2+?
      • 1...Kg1
        • 2.Qe1#
      • 1...Kf2!
    • 1.Se3+?
      • 1...Kg1
        • 2.Qe1#
      • 1...Kf2!
    • 1.Qf4+?
      • 1...Ke1
        • 2.Qc1#
      • 1...Kg1!
    • 1.Qb2?
      • 1...Ke1
        • 2.Qc1#
      • 1...e1Q
        • 2.Qg2#
      • 1...e1S
        • 2.Qf2#
      • 1...e1B
        • 2.Qg2#
      • 1...e1R
        • 2.Qf2#
        • 2.Qg2#
      • 1...Kg1!
    • 1.Qc2?
      • 1...Ke1
        • 2.Qc1#
      • 1...e1Q
        • 2.Qg2#
      • 1...e1S
        • 2.Qf2#
      • 1...e1B
        • 2.Qg2#
      • 1...e1R
        • 2.Qf2#
        • 2.Qg2#
      • 1...Kg1!
    • 1.Qxe2+?
      • 1...Kg1
        • 2.Qd1#
        • 2.Qe1#
        • 2.Qg2#
      • 1...Kxe2!
  • Keys
    • 1.Qe3!
      • threat
        • 2.Qf2#
      • 1...Ke1
        • 2.Qc1#
      • 1...e1Q
        • 2.Sh2#
      • 1...e1B
        • 2.Sh2#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • K(a);P-FLIGHT::QAR2(A)
    • P(b);OGATE,SBLOCK::QAB1(A)
    • P(b);OGATE::QAR1(A)
  • Tries
    • Try
      • K(B);P-FLIGHT
      • Vars
        • P(b);OGATE,SBLOCK::QAB1(A)
      • Refutation
        • P(c);
    • Try
      • S(C);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR2(A)
      • Refutation
        • K(a);P-FLIGHT,P_SPINP(b)
    • Try
      • S(C);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR2(A)
      • Refutation
        • K(a);P-FLIGHT,P_SPINP(b)
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR2(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(a);P-FLIGHT::QAR2(A)
        • P(b);OGATE,SBLOCK::QAB1(A)
        • P(b);OGATE::QAR1(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(a);P-FLIGHT::QAR2(A)
        • P(b);OGATE,SBLOCK::QAB1(A)
        • P(b);OGATE::QAR1(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(A);CHECK,XP(b)
      • Refutation
        • K(a);S_FLIGHT,XQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • K(a);P-FLIGHT,P_SPINP(b)::QAR2(A)
      • P(b);::S(C)
HTML5 logo

Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).