MESON Chess Problem Database

Problem Display
PID: 231370 (4K3/4B3/4k3/2p1r1p1/4P3/2N3N1/3P1P2/4Q3 w - - 0 1)

Noordermeer, B

De Nieuwe Eeuw, 1927

4K3/4B3/4k3/2p1r1p1/4P3/2N3N1/3P1P2/4Q3

#2

8 + 4

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rxe4
      • 2.Qxe4#
    • 1...Rd5
      • 2.exd5#
    • 1...Rf5
      • 2.exf5#
  • Tries
    • 1.Qe2?
      • threat
        • 2.Qa6#
      • 1...Rxe4
        • 2.Qxe4#
      • 1...Rd5
        • 2.exd5#
      • 1...Rf5
        • 2.exf5#
      • 1...c4!
  • Keys
    • 1.Qe3!
      • 1...Rxe4
        • 2.Qxe4#
      • 1...Rd5
        • 2.exd5#
      • 1...Rf5
        • 2.exf5#
      • 1...c4
        • 2.Qb6#
      • 1...g4
        • 2.Qh6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(b);OGATE,P_SPINR(b),XP(F)::QAR2(A),XR(b)
    • R(b);OGATE::QAR(A)+P(F)DCHECK,XR(b)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAR(A)
      • Vars
        • R(b);OGATE,P_SPINR(b),XP(F)::QAR2(A),XR(b)
        • R(b);OGATE::QAR(A)+P(F)DCHECK,XR(b)
      • Refutation
        • P(a);
  • Actual
    • Q(A);
    • Vars
      • R(b);OGATE,P_SPINR(b),XP(F)::QAR2(A),XR(b)
      • R(b);OGATE::QAR(A)+P(F)DCHECK,XR(b)
      • P(a);OGATE::QAR(A)
      • P(c);OGATE::QAR(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).