MESON Chess Problem Database

Problem Display
PID: 73675 (2N1B1bb/n7/1N6/1pkp2Rr/8/P1B1RnqP/2P2QP1/K7 w - - 0 1)

Postma, Eelke

Tijdschrift vd KNSB, 1942

2N1B1bb/n7/1N6/1pkp2Rr/8/P1B1RnqP/2P2QP1/K7

#2

12 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Bxc3+
      • 2.Rxc3#
    • 1...Sd4
      • 2.Bb4#
    • 1...Se5
      • 2.Qf8#
    • 1...b4
      • 2.axb4#
  • Tries
    • 1.Sa4+?
      • 1...Kc4
        • 2.Scb6#
        • 2.Qf1#
        • 2.Qe2#
      • 1...bxa4!
    • 1.Sd7+?
      • 1...Kc4
        • 2.Scb6#
        • 2.Qf1#
        • 2.Qe2#
      • 1...Kc6!
    • 1.Rxf3+?
      • 1...Bd4
        • 2.Bxd4#
        • 2.Qxd4#
      • 1...Qxf2!
    • 1.Ree5+?
      • 1...Sd4
        • 2.Bb4#
        • 2.Bxd4#
        • 2.Qxd4#
        • 2.Qf8#
      • 1...Qxf2!
  • Keys
    • 1.Be5!
      • threat
        • 2.Rc3#
      • 1...Sd4
        • 2.Qf8#
      • 1...d4
        • 2.Bd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • B(i);CHECK,OGATE,XB(F)::QAB(C)+R(G),DCHECK,XB(i)
    • S(a);N_PINB(F),SBLOCK::B(F)
    • S(a);N_PINB(F),N_SPINP(e),OGATE::QAB(C)
    • P(c);OGATE::P(E),XP(c)
  • Tries
    • Try
      • S(J);CHECK
      • Refutation
        • P(c);XS(J)
    • Try
      • S(J);CHECK
      • Refutation
        • K(d);N_SPINP(e),P-FLIGHT
    • Try
      • R(G);CHECK,XS(a)
      • Refutation
        • Q(b);XQ(C)
    • Try
      • R(G);CHECK,N_SPINB(F)
      • Refutation
        • Q(b);XQ(C)
  • Actual
    • B(F);N_PINP(e)
    • Threat
      • QAB(C)+R(G),DCHECK
    • Vars
      • S(a);N_PINB(F),OGATE::QAB(C)
      • P(e);N_PINB(F),SBLOCK::R(I)+B(F),DCHECK
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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).