MESON Chess Problem Database

Problem Display
PID: 107322 (K7/QB5P/8/8/8/5n2/6q1/7k w - - 0 1)

Zilahi, Zoltan

Mutato, 1966

K7/QB5P/8/8/8/5n2/6q1/7k

#2

4 + 3

6490 yacpdb 2009
5454 Near Snap 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Se1
      • 2.h8Q#
      • 2.h8R#
    • 1...Sd2
      • 2.h8Q#
      • 2.h8R#
    • 1...Se5
      • 2.h8Q#
      • 2.h8R#
  • Tries
    • 1.h8R+?
      • 1...Qh2
        • 2.Bxf3#
      • 1...Sh2
        • 2.Qa1#
      • 1...Sh4
        • 2.Rxh4#
      • 1...Qh3!
  • Keys
    • 1.h8Q+!
      • 1...Qh3
        • 2.Qxh3#
      • 1...Qh2
        • 2.Bxf3#
      • 1...Sh2
        • 2.Qaa1#
      • 1...Sh4
        • 2.Qxh4#

This anticipates 106131(1987)

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(c);N_GUARD,P_PINB(B),P_SPINQ(b)::P=Q
  • Tries
    • Try
      • P(C);CHECK
      • Vars
        • Q(b);P_SPINQ(b),P_SPINS(c)::B(B),XS(c)
        • S(c);P_PINB(B),P_SPINQ(b),P_SPINS(c)::QAB1(A)
        • S(c);N_GUARD,P_PINB(B),P_SPINQ(b),P_SPINS(c)::R(C),XS(c)
      • Refutation
        • Q(b);P_SPINQ(b),P_SPINS(c)
  • Actual
    • P(C);CHECK
    • Vars
      • Q(b);N_GUARD,P_SPINQ(b),P_SPINS(c)::QAR2(C),XQ(b)
      • Q(b);P_SPINQ(b),P_SPINS(c)::B(B),XS(c)
      • S(c);P_PINB(B),P_SPINQ(b),P_SPINS(c)::QAB1(A)
      • S(c);N_GUARD,P_PINB(B),P_SPINQ(b),P_SPINS(c)::QAR(C),XS(c)
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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).