MESON Chess Problem Database

Problem Display
PID: 183547 (6b1/4ppP1/3p1Q2/4NN1k/r7/6P1/3b1P1K/8 w - - 0 1)

McDowell, Michael

British Chess Magazine, 2018

6b1/4ppP1/3p1Q2/4NN1k/r7/6P1/3b1P1K/8

#2

7 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Qh4#
      • 2.g4#
    • 1...Ra2
      • 2.Qh4#
      • 2.g4#
    • 1...Ra3
      • 2.Qh4#
      • 2.g4#
    • 1...Rf4
      • 2.Qh6#
    • 1...Rh4+
      • 2.Qxh4#
    • 1...Ra5
      • 2.Qh4#
      • 2.g4#
    • 1...Ra6
      • 2.Qh4#
      • 2.g4#
    • 1...Ra7
      • 2.Qh4#
      • 2.g4#
    • 1...Ra8
      • 2.Qh4#
      • 2.g4#
    • 1...Be1
      • 2.Qh6#
    • 1...Bc3
      • 2.Qh6#
    • 1...Bb4
      • 2.Qh4#
      • 2.Qh6#
      • 2.g4#
    • 1...Bf4
      • 2.Qh4#
    • 1...Ba5
      • 2.Qh6#
    • 1...Bh6
      • 2.Qxh6#
  • Tries
    • 1.Qxf7+?
      • 1...Kg5
        • 2.Qg6#
      • 1...Bxf7!
  • Keys
    • 1.f4!
      • threat
        • 2.Qh4#
        • 2.Qg5#
        • 2.Qh6#
        • 2.g4#
      • 1...Rxf4
        • 2.Qh6#
      • 1...Bxf4
        • 2.Qh4#
      • 1...dxe5
        • 2.Qg5#
      • 1...exf6
        • 2.g4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • R(b);S_CUTB(a)::QAR1(F)
    • R(b);CHECK,N_GUARD::QAR1(F),XR(b)
    • B(a);N_GUARD::QAR1(F)
    • B(a);P_PINP(C),S_CUTR(b)::QAR1(F)
    • B(a);N_GUARD,SBLOCK::QAR1(F)
    • B(a);N_GUARD::QAR1(F),XB(a)
  • Tries
    • Try
      • Q(F);CHECK,XP(f)
      • Vars
        • K(c);P-FLIGHT::QAR1(F)
      • Refutation
        • B(g);XQ(F)
  • Actual
    • P(A);
    • Threat
      • DUALS(4)
    • Vars
      • R(b);XP(A)::QAR1(F)
      • B(a);P_PINP(C),XP(A)::QAR1(F)
      • P(d);XS(D)::QAR1(F)
      • P(e);XQ(F)::P(C)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).