MESON Chess Problem Database

Problem Display
PID: 228952 (1Q1b3K/6pb/6R1/7R/4B3/8/rq4pB/7k w - - 0 1)

Kaiser, Gerhard

2nd HM., De Saxe, 1926

1Q1b3K/6pb/6R1/7R/4B3/8/rq4pB/7k

#2

6 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qe5
      • 2.Qb1#
    • 1...Qb1
      • 2.Qxb1#
  • Tries
    • 1.Bg1+?
      • 1...Bh4
        • 2.Qh2#
      • 1...Kxg1!
  • Keys
    • 1.Rxg2!
      • threat
        • 2.Rg1#
      • 1...g5+
        • 2.Be5#
      • 1...g6+
        • 2.Rxb2#
      • 1...Qxg2
        • 2.Qb1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • Q(c);OGATE::QAR(E)
    • Q(c);OGATE::QAR(E),XQ(c)
  • Tries
    • Try
      • B(A);CHECK
      • Vars
        • B(g);P_SPINB(g)::QAR1(E)
      • Refutation
        • K(a);P-FLIGHT,XB(A)
  • Actual
    • R(D);XP(d)
    • Threat
      • B(B)+R(D),DCHECK
    • Vars
      • P(e);CHECK,S_CUTB(g)::R(C)+B(A)
      • P(e);CHECK,S_CUTB(f)::B(B)+R(D),XQ(c)
      • Q(c);OGATE,P_SPINQ(c),XR(D)::QAR(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).