MESON Chess Problem Database

Problem Display
PID: 2521 (8/4R3/b3N3/Pn1k1P2/B3NR2/8/4Q3/5K2 w - - 0 1)

Mackenzie, Arthur Ford

Source?, 0000

8/4R3/b3N3/Pn1k1P2/B3NR2/8/4Q3/5K2

#2

9 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Kc6
      • 2.Qc4#
    • 1...Bb7
      • 2.Qxb5#
    • 1...Bc8
      • 2.Qxb5#
    • 1...Sd4
      • 2.Sc7#
    • 1...Sd6
      • 2.Sc3#
      • 2.Sf6#
  • Tries
    • 1.Bb3+?
      • 1...Kc6
        • 2.Sd8#
        • 2.Qc4#
      • 1...Ke5!
    • 1.Rc7?
      • threat
        • 2.Rc5#
      • 1...Ke5
        • 2.Rc5#
      • 1...Sxc7!
    • 1.Qd3+?
      • 1...Kc6
        • 2.Sd8#
        • 2.Rc7#
        • 2.Qc4#
        • 2.Qd6#
        • 2.Qd7#
      • 1...Sd4
        • 2.Sc7#
      • 1...Ke5!
    • 1.Qc4+?
      • 1...Ke5
        • 2.Qc5#
      • 1...Kxc4!
    • 1.Qa2+?
      • 1...Kc6
        • 2.Sd4#
        • 2.Sd8#
        • 2.Rc7#
        • 2.Qc4#
      • 1...Ke5!
    • 1.Qd2+?
      • 1...Kc4
        • 2.Sd6#
      • 1...Ke5
        • 2.S6c5#
        • 2.S6g5#
        • 2.Sc7#
        • 2.Sg7#
        • 2.Sd8#
        • 2.Sf8#
      • 1...Kc6
        • 2.Sd8#
        • 2.Rc7#
        • 2.Qd6#
        • 2.Qd7#
      • 1...Sd4+!
  • Keys
    • 1.f6!
      • 1...Ke5
        • 2.Qh5#
      • 1...Kc6
        • 2.Qc4#
      • 1...Sa3
        • 2.Rf5#
      • 1...Bb7
        • 2.Qxb5#
      • 1...Bc8
        • 2.Qxb5#
      • 1...Sc3
        • 2.Rf5#
      • 1...Sd4
        • 2.Sc7#
      • 1...Sd6
        • 2.Sc3#
      • 1...Sa7
        • 2.Rf5#
      • 1...Sc7
        • 2.Rf5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • K(b);P_SPINS(a),S_FLIGHT::QAR2(B)
    • B(c);N_GUARD::QAR2(B),XS(a)
    • S(a);N_GUARD,P_PINQ(B),SBLOCK::S(H)
  • Tries
    • Try
      • B(C);CHECK
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • R(I);
      • Threat
        • R1(I)
      • Vars
        • K(b);P-FLIGHT::R(I)
      • Refutation
        • S(a);P_PINQ(B),XR(I)
    • Try
      • Q(B);CHECK
      • Vars
        • S(a);P_PINQ(B),P_SPINS(a)::S(H)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR2(B)
      • Refutation
        • K(b);S_FLIGHT,XQ(B)
    • Try
      • Q(B);CHECK
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);S_FLIGHT::R(E)+S(D),DCHECK
      • Refutation
        • S(a);CHECK,P_SPINS(a)
  • Actual
    • P(G);
    • Vars
      • K(b);P-FLIGHT::QAR(B)
      • K(b);P_SPINS(a),S_FLIGHT::QAR2(B)
      • S(a);P_PINQ(B)::R(E)
      • B(c);N_GUARD::QAR2(B),XS(a)
      • S(a);N_GUARD,P_PINQ(B),SBLOCK::S(H)
      • S(a);N_GUARD,P_PINQ(B),SBLOCK::S(D)
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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).