MESON Chess Problem Database

Problem Display
PID: 66755 (8/3K4/8/2pkp1N1/8/Q7/5n2/3B4 w - - 0 1)

de Haas, Bastian Evert

Schakend Nederland, 1969

8/3K4/8/2pkp1N1/8/Q7/5n2/3B4

#2

4 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Sxd1
      • 2.Qd3#
    • 1...Sh1
      • 2.Qd3#
    • 1...Sd3
      • 2.Qxd3#
    • 1...Sh3
      • 2.Qd3#
    • 1...Se4
      • 2.Qd3#
    • 1...Sg4
      • 2.Qd3#
    • 1...c4
      • 2.Qd6#
  • Tries
    • 1.Bb3+?
      • 1...c4
        • 2.Qd6#
      • 1...Kd4!
  • Keys
    • 1.Se6!
      • 1...Kc4
        • 2.Qb3#
      • 1...Ke4
        • 2.Qf3#
      • 1...Sxd1
        • 2.Qd3#
      • 1...Sh1
        • 2.Qd3#
      • 1...Sd3
        • 2.Qxd3#
      • 1...Sh3
        • 2.Qd3#
      • 1...Se4
        • 2.Qd3#
      • 1...Sg4
        • 2.Qd3#
      • 1...c4
        • 2.Qa8#
      • 1...e4
        • 2.Qxc5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD,XB(A)::QAR2(B)
    • S(a);N_GUARD::QAR2(B)
    • S(a);N_GUARD::QAR2(B),XS(a)
    • P(b);OGATE,SBLOCK::QAR1(B)
  • Tries
    • Try
      • B(A);CHECK
      • Vars
        • P(b);OGATE,P_SPINP(b)::QAR1(B)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • S(C);
    • Vars
      • K(c);S_FLIGHT::QAB1(B)
      • S(a);N_GUARD,XB(A)::QAR2(B)
      • S(a);N_GUARD::QAR2(B)
      • S(a);N_GUARD::QAR2(B),XS(a)
      • P(b);SBLOCK::QAB(B)
      • P(d);SBLOCK::QAR1(B),XP(b)
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).