MESON Chess Problem Database

Problem Display
PID: 155691 (2K1R1B1/1p1P3b/3pN2r/2Pq2P1/3pkpQN/3p4/4p3/2b5 w - - 0 1)

de Jong, Leonard Nicholaas

Nederlandse Bond van Probleemvrienden, 1932

2K1R1B1/1p1P3b/3pN2r/2Pq2P1/3pkpQN/3p4/4p3/2b5

#2

9 + 11

1577 Jaarboek 1932

SOLUTION

  • SOUND
  • Sets
    • 1...Ke3
      • 2.Qxf4#
    • 1...Qxc5+
      • 2.Sxc5#
    • 1...Qe5
      • 2.Qf3#
    • 1...Qxg5
      • 2.Sxg5#
    • 1...Bb2
      • 2.Qxf4#
    • 1...Ba3
      • 2.Qxf4#
    • 1...d2
      • 2.Qxe2#
    • 1...dxc5
      • 2.Sxc5#
  • Tries
    • 1.gxh6?
      • threat
        • 2.Sg5#
      • 1...Qc6+
        • 2.Sc7#
      • 1...Qxc5+
        • 2.Sxc5#
      • 1...Ke3
        • 2.Qxf4#
      • 1...Qxe6
        • 2.Qxe6#
      • 1...Qg5
        • 2.Sxg5#
      • 1...d2
        • 2.Qxe2#
      • 1...Qe5
        • 2.Qf3#
      • 1...Ke5!
  • Keys
    • 1.g6!
      • threat
        • 2.Sg5#
      • 1...Qc6+
        • 2.Sc7#
      • 1...Qxc5+
        • 2.Sxc5#
      • 1...Ke3
        • 2.Qxf4#
      • 1...Ke5
        • 2.Qf5#
      • 1...Qxe6
        • 2.Qxe6#
      • 1...Qg5
        • 2.Sxg5#
      • 1...d2
        • 2.Qxe2#
      • 1...Qe5
        • 2.Qf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • K(e);N_SPINP(f),P-FLIGHT::QAB1(A),XP(f)
    • Q(g);CHECK,XP(C)::R(H)+S(E),DCHECK,XQ(g)
    • Q(g);SBLOCK::QAB1(A)
    • Q(g);XP(D)::R(H)+S(E),DCHECK,XQ(g)
    • B(a);N_GUARD::QAR1(A),XP(f)
    • P(c);N_GUARD,S_CUTB(a)::QAR2(A),XP(b)
    • P(h);XP(C)::R(H)+S(E),DCHECK,XP(h)
  • Tries
    • Try
      • P(D);XR(i)
      • Threat
        • R(H)+S(E),DCHECK
      • Vars
        • Q(g);CHECK,N_GUARD::R(H)+S(E)
        • Q(g);CHECK,XP(C)::R(H)+S(E),DCHECK,XQ(g)
        • K(e);N_SPINP(f),P-FLIGHT::QAB1(A),XP(f)
        • Q(g);OGATE,P_PINP(F),P_SPINQ(g),XS(E)::QAR2(A),XQ(g)
        • Q(g);::R(H)+S(E),DCHECK,XQ(g)
        • P(c);N_GUARD,S_CUTB(a)::QAR2(A),XP(b)
        • Q(g);SBLOCK::QAB1(A)
      • Refutation
        • K(e);N_SPINP(f),P-FLIGHT
  • Actual
    • P(D);
    • Threat
      • R(H)+S(E),DCHECK
    • Vars
      • Q(g);CHECK,N_GUARD::R(H)+S(E)
      • Q(g);CHECK,XP(C)::R(H)+S(E),DCHECK,XQ(g)
      • K(e);N_SPINP(f),P-FLIGHT::QAB1(A),XP(f)
      • K(e);N_SPINP(f),P-FLIGHT::QAR1(A)
      • Q(g);OGATE,P_PINP(F),P_SPINQ(g),XS(E)::QAR2(A),XQ(g)
      • Q(g);::R(H)+S(E),DCHECK,XQ(g)
      • P(c);N_GUARD,S_CUTB(a)::QAR2(A),XP(b)
      • Q(g);SBLOCK::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).