MESON Chess Problem Database

Problem Display
PID: 256964 (2N5/8/k7/8/KRq5/4n3/4Q3/8 w - - 0 1)

Surkov, Valery Albertovich

Buletin Problemistic, 1995

2N5/8/k7/8/KRq5/4n3/4Q3/8

#2

4 + 3

15601 Albrecht-Leiss-Degener Collection 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe2
      • 2.Rb6#
    • 1...Qd3
      • 2.Rb6#
    • 1...Qb5+
      • 2.Qxb5#
    • 1...Sd1
      • 2.Qxc4#
    • 1...Sf1
      • 2.Qxc4#
    • 1...Sc2
      • 2.Qxc4#
    • 1...Sg2
      • 2.Qxc4#
    • 1...Sg4
      • 2.Qxc4#
    • 1...Sd5
      • 2.Qxc4#
    • 1...Sf5
      • 2.Qxc4#
  • Tries
    • 1.Qf1?
      • 1...Qb5+
        • 2.Qxb5#
      • 1...Qxf1
        • 2.Rb6#
      • 1...Qe2
        • 2.Rb6#
        • 2.Qf6#
      • 1...Qd3
        • 2.Rb6#
      • 1...Sd1
        • 2.Qxc4#
      • 1...Sc2
        • 2.Qxc4#
      • 1...Sg2
        • 2.Qxc4#
      • 1...Sg4
        • 2.Qxc4#
      • 1...Sd5
        • 2.Qxc4#
      • 1...Sf5
        • 2.Qxc4#
      • 1...Sxf1!
  • Keys
    • 1.Qd3!
      • 1...Qb5+
        • 2.Qxb5#
      • 1...Qxd3
        • 2.Rb6#
      • 1...Sd1
        • 2.Qxc4#
      • 1...Sf1
        • 2.Qxc4#
      • 1...Sc2
        • 2.Qxc4#
      • 1...Sg2
        • 2.Qxc4#
      • 1...Sg4
        • 2.Qxc4#
      • 1...Sd5
        • 2.Qxc4#
      • 1...Sf5
        • 2.Qxc4#

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • Q(b);N_PINR(C),N_SPINQ(b),XQ(A)::R1(C)
    • Q(b);N_PINR(C)::R1(C)
    • Q(b);CHECK,N_PINR(C),OGATE::QAB1(A),XQ(b)
    • S(a);N_GUARD::QAB(A),XQ(b)
  • Tries
    • Try
      • Q(A);
      • Vars
        • Q(b);CHECK,N_PINR(C),OGATE::QAB1(A),XQ(b)
        • Q(b);N_PINR(C),N_SPINQ(b),XQ(A)::R1(C)
        • Q(b);N_PINR(C)::R1(C)
        • S(a);N_GUARD::QAB(A),XQ(b)
      • Refutation
        • S(a);N_SPINQ(b),XQ(A)
  • Actual
    • Q(A);
    • Vars
      • Q(b);CHECK,N_PINR(C),OGATE::QAB1(A),XQ(b)
      • Q(b);N_PINR(C),N_SPINQ(b),XQ(A)::R1(C)
      • S(a);N_GUARD::QAB(A),XQ(b)
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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).