MESON Chess Problem Database

Problem Display
PID: 206998 (8/8/Q1n5/1bp5/r1P1B3/PkP4R/N1R1K3/8 w - - 0 1)

Cameron, William E

New York Clipper, 1859

8/8/Q1n5/1bp5/r1P1B3/PkP4R/N1R1K3/8

#2

9 + 5

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rb4
      • 2.cxb4#
    • 1...Rxc4
      • 2.Sc1#
    • 1...Sb4
      • 2.cxb4#
    • 1...Sd4+
      • 2.cxd4#
  • Tries
    • 1.Sc1+?
      • 1...Kxa3
        • 2.Ra2#
      • 1...Kxc4!
  • Keys
    • 1.Qxb5+!
      • 1...Kxa3
        • 2.Qb2#
      • 1...Rb4
        • 2.cxb4#
      • 1...Sb4
        • 2.cxb4#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • R(b);OGATE::R(F)+P(E),XR(b)
    • R(b);SBLOCK,XP(G)::S(A)
    • S(e);OGATE::R(F)+P(E),XS(e)
    • S(e);CHECK,OGATE::R(F)+P(E),XS(e)
  • Tries
    • Try
      • S(A);CHECK
      • Vars
        • K(a);P-FLIGHT,P_SPINR(b),XP(D)::R1(B)
      • Refutation
        • K(a);P_SPINB(c),S_FLIGHT,XP(G)
  • Actual
    • Q(I);CHECK,N_SPINP(G),XB(c)
    • Vars
      • K(a);OGATE,P-FLIGHT,XP(D)::QAB1(I)
      • R(b);OGATE,P_SPINR(b)::R(F)+P(E),XR(b)
      • S(e);OGATE,P_SPINS(e)::R(F)+P(E),XS(e)
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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).