MESON Chess Problem Database

Problem Display
PID: 17220 (8/8/8/8/QN6/5N2/2p5/3knK2 w - - 0 1)

Lazard, Frederic

La Strategie, 1925

8/8/8/8/QN6/5N2/2p5/3knK2

#2

4 + 3

6315 Mes problemes et etudes d'echecs (Lazard) 1929
273 Mat Plus 1995
5454 Near Snap 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Kc1
      • 2.Qa1#
    • 1...Sg2
      • 2.Qxc2#
    • 1...Sd3
      • 2.Qxc2#
    • 1...Sxf3
      • 2.Qxc2#
  • Tries
    • 1.Kf2?
      • 1...Kc1
        • 2.Qa1#
      • 1...Sxf3
        • 2.Qxc2#
      • 1...Sg2
        • 2.Qxc2#
      • 1...Sd3+!
    • 1.Sxe1?
      • threat
        • 2.Qxc2#
      • 1...Kc1
        • 2.Qxc2#
      • 1...Kd2!
    • 1.Qb3?
      • 1...Sxf3
        • 2.Qxc2#
      • 1...Sg2
        • 2.Qxc2#
      • 1...Sd3
        • 2.Qxc2#
      • 1...Kc1!
  • Keys
    • 1.Qa2!
      • 1...Kc1
        • 2.Qa1#
      • 1...Sxf3
        • 2.Qxc2#
      • 1...c1Q
        • 2.Qe2#
      • 1...c1S
        • 2.Qd2#
      • 1...c1B
        • 2.Qe2#
      • 1...c1R
        • 2.Qd2#
        • 2.Qe2#
      • 1...Sg2
        • 2.Qxc2#
      • 1...Sd3
        • 2.Qxc2#

This anticipates 8002(1995)

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(a);N_SPINP(c),P-FLIGHT::QAR2(C)
    • S(b);N_GUARD::QAB1(C),XP(c)
    • S(b);N_GUARD,XS(B)::QAB1(C),XP(c)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Vars
        • K(a);N_SPINP(c),P-FLIGHT::QAR2(C)
        • S(b);N_GUARD,XS(B)::QAB1(C),XP(c)
        • S(b);N_GUARD::QAB1(C),XP(c)
      • Refutation
        • S(b);CHECK
    • Try
      • S(B);XS(b)
      • Threat
        • QAB1(C),XP(c)
      • Vars
        • K(a);N_SPINP(c),P-FLIGHT::QAR1(C),XP(c)
      • Refutation
        • K(a);N_SPINP(c),P-FLIGHT
    • Try
      • Q(C);
      • Vars
        • S(b);N_GUARD,XS(B)::QAB1(C),XP(c)
        • S(b);N_GUARD::QAB1(C),XP(c)
      • Refutation
        • K(a);N_SPINP(c),P-FLIGHT
  • Actual
    • Q(C);N_PINP(c)
    • Vars
      • K(a);P-FLIGHT::QAR2(C)
      • S(b);N_GUARD,XS(B)::QAB1(C),XP(c)
      • P(c);OGATE,SBLOCK::QAB1(C)
      • P(c);OGATE::QAR1(C)
      • S(b);N_GUARD::QAB1(C),XP(c)
HTML5 logo

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).