MESON Chess Problem Database

Problem Display
PID: 268555 (2b2KN1/3pNp2/1pp2R2/R1b1k1P1/2q2p2/2P2Q2/8/8 w - - 0 1)

Mackenzie, A

British Chess Magazine, 1934

2b2KN1/3pNp2/1pp2R2/R1b1k1P1/2q2p2/2P2Q2/8/8

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qa2
      • 2.Qxf4#
    • 1...Qe2
      • 2.Qxe2#
      • 2.Qxf4#
    • 1...Qb3
      • 2.Qe2#
      • 2.Qxf4#
    • 1...Qd3
      • 2.Qxf4#
    • 1...Qb5
      • 2.Qxf4#
    • 1...Qd5
      • 2.Qxf4#
    • 1...Qa6
      • 2.Qxf4#
    • 1...Qe6
      • 2.Qxf4#
    • 1...Qxc3
      • 2.Qxf4#
    • 1...d6
      • 2.Sxc6#
  • Tries
    • 1.Rxc5+?
      • 1...Qd5
        • 2.Qe2#
        • 2.Qxf4#
      • 1...Qxc5
        • 2.Qxf4#
      • 1...d5
        • 2.Sxc6#
      • 1...bxc5!
  • Keys
    • 1.Sh6!
      • threat
        • 2.Sg4#
      • 1...Qxc3
        • 2.Qxf4#
      • 1...Qe6
        • 2.Qxf4#
      • 1...d5
        • 2.Sxf7#
      • 1...d6
        • 2.Sxc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • Q(a);N_GUARD::QAB1(B),XP(b)
    • Q(a);N_GUARD,N_SPINB(c)::QAB1(B),XP(b)
    • Q(a);N_GUARD,XP(A)::QAB1(B),XP(b)
    • P(g);N_PINS(F)::S(F),XP(f)
  • Tries
    • Try
      • R(C);CHECK,N_SPINS(F),XB(c)
      • Vars
        • Q(a);P_PINS(F),XR(C)::QAB1(B),XP(b)
        • P(g);P_SPINP(g)::S(F),XP(f)
      • Refutation
        • P(e);XR(C)
  • Actual
    • S(H);
    • Threat
      • S(H)
    • Vars
      • Q(a);N_GUARD,XP(A)::QAB1(B),XP(b)
      • Q(a);N_GUARD::QAB1(B),XP(b)
      • P(g);N_SPINB(c),S_CUTQ(a)::S(H),XP(h)
      • P(g);N_PINS(F)::S(F),XP(f)
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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).