MESON Chess Problem Database

Problem Display
PID: 106131 (k7/1q3P2/2n5/8/8/5B2/8/6QK w - - 0 1)

Froberg, Johan Hilding Laurentius

Thema Danicum, 1987

k7/1q3P2/2n5/8/8/5B2/8/6QK

#2

4 + 3

6490 yacpdb 2009
5454 Near Snap 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Sb4
      • 2.f8Q#
      • 2.f8R#
    • 1...Sa5
      • 2.f8Q#
      • 2.f8R#
    • 1...Se5
      • 2.f8Q#
      • 2.f8R#
  • Tries
    • 1.f8R+?
      • 1...Qb8
        • 2.Bxc6#
      • 1...Sb8
        • 2.Qa1#
      • 1...Sd8
        • 2.Rxd8#
      • 1...Qc8!
  • Keys
    • 1.f8Q+!
      • 1...Qc8
        • 2.Qxc8#
      • 1...Qb8
        • 2.Bxc6#
      • 1...Sb8
        • 2.Qa1#
      • 1...Sd8
        • 2.Qxd8#

Anticipated by 107322(1966)

FEATURES

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