MESON Chess Problem Database

Problem Display
PID: 225824 (3R1b1n/2p5/2B3n1/1N4pQ/p1k4r/2P5/K5p1/5bB1 w - - 0 1)

van Dijk, Nils Gustav Gerard

3rd Prize, Praca, 1958

3R1b1n/2p5/2B3n1/1N4pQ/p1k4r/2P5/K5p1/5bB1

#2

7 + 10

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Be2
      • 2.Qxe2#
    • 1...g4
      • 2.Rd4#
      • 2.Qd5#
  • Tries
    • 1.Bd5+?
      • 1...Kd3
        • 2.Qd1#
      • 1...Kxb5!
    • 1.Qf3?
      • threat
        • 2.Qd5#
      • 1...Re4
        • 2.Qxe4#
      • 1...Sf4
        • 2.Qe4#
      • 1...Se7
        • 2.Sa3#
      • 1...Rd4!
    • 1.Qxg5?
      • threat
        • 2.Qd5#
      • 1...Rd4
        • 2.Rxd4#
      • 1...Sf4
        • 2.Rd4#
      • 1...Rh5
        • 2.Rd4#
      • 1...Se7
        • 2.Qxh4#
        • 2.Qc5#
      • 1...Se5!
  • Keys
    • 1.Qd1!
      • threat
        • 2.Qd5#
      • 1...Rd4
        • 2.Qxd4#
      • 1...Bd3
        • 2.Qxd3#
      • 1...Sf4
        • 2.Qd4#
      • 1...Se7
        • 2.Qxa4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • B(a);N_GUARD::QAB(E),XB(a)
  • Tries
    • Try
      • B(F);CHECK
      • Vars
        • K(d);S_FLIGHT::QAR2(E)
      • Refutation
        • K(d);S_FLIGHT,XS(D)
    • Try
      • Q(E);
      • Threat
        • QAB1(E)
      • Vars
        • R(e);N_GUARD::QAR2(E),XR(e)
        • S(g);S_CUTR(e)::QAR2(E)
        • S(g);S_CUTB(i)::S(D)
      • Refutation
        • R(e);
    • Try
      • Q(E);XP(f)
      • Threat
        • QAB1(E)
      • Vars
        • R(e);N_GUARD::R1(G),XR(e)
        • S(g);S_CUTR(e)::R1(G)
        • R(e);N_GUARD::R1(G)
      • Refutation
        • S(g);
  • Actual
    • Q(E);
    • Threat
      • QAB1(E)
    • Vars
      • R(e);N_GUARD::QAR1(E),XR(e)
      • B(a);N_GUARD::QAB1(E),XB(a)
      • S(g);S_CUTR(e)::QAR1(E)
      • S(g);S_CUTB(i)::QAR2(E),XP(c)
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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).