MESON Chess Problem Database

Problem Display
PID: 226325 (Q5B1/1n1q1n2/8/1RPkPR2/2rNr3/2P1PP2/7b/7K w - - 0 1)

Mihalek, Frederick M

US Problem Bulletin, 1981

Q5B1/1n1q1n2/8/1RPkPR2/2rNr3/2P1PP2/7b/7K

#2

11 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qd8
      • 2.Bxf7#
      • 2.Qxb7#
    • 1...Rxc5
      • 2.Qa2#
    • 1...Rxe5
      • 2.e4#
  • Tries
    • 1.Bxf7+?
      • 1...Qe6
        • 2.Bxe6#
        • 2.Qxb7#
      • 1...Qxf7!
    • 1.Qxb7+?
      • 1...Qc6
        • 2.Bxf7#
        • 2.Qxc6#
      • 1...Qxb7!
    • 1.e6+?
      • 1...Re5
        • 2.e4#
      • 1...Se5
        • 2.exd7#
      • 1...Be5!
  • Keys
    • 1.c6+!
      • 1...Rc5
        • 2.Qa2#
      • 1...Sc5
        • 2.cxd7#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • R(b);OGATEB,P_SPINR(b),XP(G)::QAB(J)
    • R(c);OGATE,P_SPINR(c),XP(H)::P(C)
  • Tries
    • Try
      • B(K);CHECK,XS(g)
      • Refutation
        • Q(f);XB(K)
    • Try
      • Q(J);CHECK,P_PINS(g),XS(e)
      • Refutation
        • Q(f);XQ(J)
    • Try
      • P(H);CHECK
      • Vars
        • R(c);OGATE,P_SPINR(c)::P(C)
        • S(g);N_SPINS(e),P_SPINS(g),S_CUTB(a),S_CUTR(c)::B(K)+P(H),XQ(f)
      • Refutation
        • B(a);P_SPINB(a)
  • Actual
    • P(G);CHECK,N_PINS(e),P_PINS(g)
    • Vars
      • R(b);P_SPINR(b),S_CUTS(e)::QAB(J)
      • S(e);N_SPINS(g),P_SPINS(e),S_CUTR(b)::QAB(J)+P(G),XQ(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).