MESON Chess Problem Database

Problem Display
PID: 11602 (2N1nR2/3p4/3pkp2/8/4K3/8/8/4Q3 w - - 0 1)

Niemeijer, Meindert

Arbejder-Skak, 1970

2N1nR2/3p4/3pkp2/8/4K3/8/8/4Q3

#2

4 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...d5+
      • 2.Kf4#
    • 1...f5+
      • 2.Kd4#
  • Tries
    • 1.Qd2?
      • threat
        • 2.Qd5#
      • 1...d5+
        • 2.Qxd5#
      • 1...Sc7
        • 2.Qxd6#
      • 1...f5+!
    • 1.Qf2?
      • threat
        • 2.Qf5#
      • 1...f5+
        • 2.Qxf5#
      • 1...Sg7
        • 2.Rxf6#
        • 2.Qxf6#
      • 1...d5+!
    • 1.Qd1?
      • threat
        • 2.Qd5#
      • 1...d5+
        • 2.Qxd5#
      • 1...Sc7
        • 2.Qxd6#
      • 1...f5+!
    • 1.Qf1?
      • threat
        • 2.Qf5#
      • 1...f5+
        • 2.Qxf5#
      • 1...Sg7
        • 2.Rxf6#
        • 2.Qxf6#
      • 1...d5+!
  • Keys
    • 1.Qa5!
      • threat
        • 2.Qd5#
        • 2.Qf5#
      • 1...d5+
        • 2.Qxd5#
      • 1...f5+
        • 2.Qxf5#
      • 1...Sc7
        • 2.Qf5#
      • 1...Sg7
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(a);CHECK,SBLOCK::QAR(A)+K(B)
    • P(c);CHECK::QAR(A)+K(B)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • P(a);CHECK::QAB1(A),XP(a)
        • S(e);N_GUARD::QAR1(A),XP(a)
      • Refutation
        • P(c);CHECK
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • P(c);CHECK::QAB1(A),XP(c)
      • Refutation
        • P(a);CHECK
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • P(a);CHECK::QAB1(A),XP(a)
        • S(e);N_GUARD::QAR1(A),XP(a)
      • Refutation
        • P(c);CHECK
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • P(c);CHECK::QAB1(A),XP(c)
      • Refutation
        • P(a);CHECK
  • Actual
    • Q(A);
    • Threat
      • DUALS(2)
    • Vars
      • P(a);CHECK::QAB1(A),XP(a)
      • P(c);CHECK::QAB1(A),XP(c)
      • S(e);::QAB1(A)
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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).