MESON Chess Problem Database

Problem Display
PID: 263758 (8/8/4ppQ1/rP2k3/8/P1NR1pPb/2Kn4/8 w - - 0 1)

van der Werf, JD

Comm., Tijdschrift vd NSB, 1903

8/8/4ppQ1/rP2k3/8/P1NR1pPb/2Kn4/8

#2

7 + 7

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Sb1
      • 2.Qe4#
    • 1...Sf1
      • 2.Qe4#
    • 1...Sb3
      • 2.Qe4#
    • 1...Sc4
      • 2.Qe4#
    • 1...Se4
      • 2.Qxe4#
    • 1...f5
      • 2.Qg7#
  • Tries
    • 1.Qh5+?
      • 1...f5
        • 2.Qh8#
      • 1...Bf5!
    • 1.Qg5+?
      • 1...Bf5
        • 2.Qf4#
      • 1...f5
        • 2.Qg7#
      • 1...fxg5!
    • 1.Qh6?
      • threat
        • 2.Qf4#
      • 1...Kf5
        • 2.Qh5#
      • 1...f5
        • 2.Qg7#
        • 2.Qh8#
      • 1...Ra4!
  • Keys
    • 1.Qe8!
      • threat
        • 2.Rd5#
      • 1...Kf5
        • 2.Qh5#
      • 1...Rxb5
        • 2.Qxb5#
      • 1...Bf5
        • 2.Qb8#
      • 1...f5
        • 2.Qh8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • S(a);N_GUARD::QAR1(G)
    • S(a);N_GUARD::QAR1(G),XS(a)
    • P(g);OGATEB,SBLOCK::QAB(G)
  • Tries
    • Try
      • Q(G);CHECK
      • Vars
        • P(g);OGATEB,P_SPINP(g),SBLOCK::QAB(G)
      • Refutation
        • B(c);P_PINR(D),P_SPINB(c)
    • Try
      • Q(G);CHECK
      • Vars
        • B(c);P_PINR(D),P_SPINB(c)::QAB1(G)
        • P(g);OGATEB,P_SPINP(g),SBLOCK::QAB(G)
      • Refutation
        • P(g);XQ(G)
    • Try
      • Q(G);
      • Threat
        • QAB1(G)
      • Vars
        • K(e);P-FLIGHT,S_CUTB(c),S_CUTP(g)::QAR2(G)
      • Refutation
        • R(d);
  • Actual
    • Q(G);P_PINP(f)
    • Threat
      • R1(D)
    • Vars
      • K(e);N_SPINP(f),P-FLIGHT,S_CUTB(c),S_CUTP(g)::QAR2(G)
      • R(d);OGATE,XP(F)::QAR(G),XR(d)
      • B(c);P_PINR(D),SBLOCK::QAB(G)
      • P(g);OGATEB,SBLOCK::QAB(G)
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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).