MESON Chess Problem Database

Problem Display
PID: 194835 (7b/8/1p3R1p/2pk4/1P2rB2/8/1K1Nn3/6Q1 w - - 0 1)

Anonymous

Sissa, 1864

7b/8/1p3R1p/2pk4/1P2rB2/8/1K1Nn3/6Q1

#2

6 + 7

14986 White-Hume Collection 2019
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Rd4
      • 2.Rd6#
      • 2.Qg8#
    • 1...Sc3
      • 2.Rd6#
    • 1...Sd4
      • 2.Rd6#
    • 1...b5
      • 2.Qxc5#
  • Tries
    • 1.Qg5+?
      • 1...Kd4
        • 2.Rd6#
      • 1...Re5
        • 2.Qxe5#
      • 1...hxg5!
    • 1.Qg8+?
      • 1...Kd4
        • 2.Rd6#
        • 2.Qc4#
        • 2.Qd8#
      • 1...Re6!
  • Keys
    • 1.Qd4+!
      • 1...Kxd4
        • 2.Rd6#
      • 1...Rxd4
        • 2.Rd6#
      • 1...Sxd4
        • 2.Rd6#
      • 1...cxd4
        • 2.Rd6#

Anticipated by 207017(1861)

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • S(a);N_PINR(F)::R1(F)
    • P(e);N_GUARD::QAR1(A),XP(c)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • K(d);N_PINR(F),P-FLIGHT::R(F)
        • R(b);N_GUARD,N_PINR(F),P_SPINR(b)::QAR1(A),XR(b)
      • Refutation
        • P(f);XQ(A)
    • Try
      • Q(A);CHECK
      • Refutation
        • R(b);P_SPINR(b)
  • Actual
    • Q(A);CHECK,N_SPINR(F)
    • Vars
      • K(d);P-FLIGHT,XQ(A)::R(F)
      • R(b);SBLOCK,XQ(A)::R1(F)
      • S(a);SBLOCK,XQ(A)::R1(F)
      • P(c);SBLOCK,XQ(A)::R1(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).