MESON Chess Problem Database

Problem Display
PID: 7571 (5RB1/q2N1r2/b1ppp2p/Rpbk1PnK/6p1/1p1Pp3/4N3/5Q2 w - - 0 1)

de Haas, Bastian Evert

1st Prize, Schakend Nederland, 1991

5RB1/q2N1r2/b1ppp2p/Rpbk1PnK/6p1/1p1Pp3/4N3/5Q2

#2

9 + 14

SOLUTION

  • SOUND
  • Sets
    • 1...Rxf5
      • 2.Rxf5#
      • 2.Qxf5#
    • 1...Bd4
      • 2.Sf4#
    • 1...Sh3
      • 2.Qg2#
      • 2.Qh1#
    • 1...Sh7
      • 2.Qg2#
      • 2.Qh1#
    • 1...exf5
      • 2.Qxf5#
    • 1...e5
      • 2.Sf6#
  • Tries
    • 1.Qg2+?
      • 1...Se4
        • 2.Qxe4#
      • 1...Sf3!
    • 1.Qh1+?
      • 1...Se4
        • 2.Qxe4#
      • 1...Sf3!
    • 1.Qf4?
      • threat
        • 2.Sc3#
      • 1...exf5
        • 2.Qxf5#
      • 1...Bb4
        • 2.Qc4#
      • 1...Se4
        • 2.Qxe4#
      • 1...b4
        • 2.Qd4#
      • 1...Bd4!
  • Keys
    • 1.Qa1!
      • threat
        • 2.Sf4#
      • 1...Rxf5
        • 2.Rxf5#
      • 1...Sh3
        • 2.Qh1#
      • 1...b2
        • 2.Qa2#
      • 1...e5
        • 2.Sf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • B(e);P_SPINP(d),SBLOCK::S(B)
    • P(k);OGATE,P_SPINR(n),XP(E)::QAR2(A),XP(k)
    • P(k);P_SPINR(n),SBLOCK::S(G)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • S(g);N_GUARD,P_SPINS(g)::QAB1(A),XS(g)
      • Refutation
        • S(g);P_SPINS(g)
    • Try
      • Q(A);CHECK
      • Vars
        • S(g);N_GUARD,P_SPINS(g)::QAB1(A),XS(g)
      • Refutation
        • S(g);P_SPINS(g)
    • Try
      • Q(A);
      • Threat
        • S(B)
      • Vars
        • P(k);OGATE,P_SPINR(n),XP(E)::QAR2(A),XP(k)
        • B(e);P_SPINP(d)::QAB1(A)
        • S(g);N_GUARD::QAB1(A),XS(g)
        • P(d);P_SPINB(e)::QAR1(A)
      • Refutation
        • B(e);P_SPINP(d)
  • Actual
    • Q(A);
    • Threat
      • S(B)
    • Vars
      • R(n);OGATE,P_SPINP(k),XP(E)::R(H),XR(n)
      • S(g);N_GUARD::QAB(A)
      • P(a);OGATEB::QAB(A)
      • P(k);P_SPINR(n)::S(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).