MESON Chess Problem Database

Problem Display
PID: 155971 (N1B5/qpPK4/k1P5/8/1Q1p4/8/4p3/2rb4 w - - 0 1)

Meurs, Abraham

Aarsskrift for DSK, 1937

N1B5/qpPK4/k1P5/8/1Q1p4/8/4p3/2rb4

#2

6 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qb6
      • 2.Qxb6#
    • 1...Qb8
      • 2.Qb6#
    • 1...Rc2
      • 2.Qa4#
    • 1...Ba4
      • 2.Qxa4#
  • Tries
    • 1.Qa3+?
      • 1...Ba4
        • 2.Qxa4#
      • 1...Kb5!
  • Keys
    • 1.cxb7!
      • threat
        • 2.b8S#
      • 1...Rxc7+
        • 2.Sxc7#
      • 1...Ba4+
        • 2.Qxa4#
      • 1...Qxb7
        • 2.Qb6#
      • 1...Qxa8
        • 2.bxa8Q#
        • 2.bxa8R#
      • 1...Qc5
        • 2.b8Q#
        • 2.b8B#
      • 1...Qb6
        • 2.Qxb6#
      • 1...Qb8
        • 2.Qb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • Q(f);N_GUARD::QAR1(A),XQ(f)
    • Q(f);N_GUARD::QAR1(A)
    • R(a);S_CUTB(b)::QAR2(A)
    • B(b);N_GUARD,P_PINP(B)::QAR2(A),XB(b)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • B(b);N_GUARD,P_PINP(B),P_SPINB(b)::QAR2(A),XB(b)
      • Refutation
        • K(e);N_SPINP(g),S_FLIGHT
  • Actual
    • P(B);XP(g)
    • Threat
      • P=S
    • Vars
      • R(a);CHECK,XP(C)::S(E),XR(a)
      • B(b);CHECK,N_GUARD::QAR2(A),XB(b)
      • Q(f);N_GUARD,P_PINP(C),P_SPINQ(f),XP(B)::QAR1(A)
      • Q(f);OGATE,XS(E)::PXQ(f)=Q
      • Q(f);N_GUARD::P=Q
      • Q(f);N_GUARD::QAR1(A),XQ(f)
      • Q(f);N_GUARD::QAR1(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).