MESON Chess Problem Database

Problem Display
PID: 141520 (rn1RKBnr/p2pppN1/N1pk1pP1/2p2Q1p/5P2/8/5q2/7B w - - 0 1)

van Gool, Johann Christoffel

2nd Prize, 07. Kwik-Toernooi, 1976

rn1RKBnr/p2pppN1/N1pk1pP1/2p2Q1p/5P2/8/5q2/7B

#2

9 + 14

102 Probleemblad 1976

SOLUTION

  • SOUND
  • Sets
    • 1...Qe1
      • 2.Qd3#
      • 2.Qxc5#
    • 1...Qg3
      • 2.Qxc5#
    • 1...Qh4
      • 2.Qd3#
      • 2.Qxc5#
    • 1...Qf1
      • 2.Qxc5#
    • 1...Qa2
      • 2.Qxc5#
    • 1...Qb2
      • 2.Qxc5#
    • 1...Qd2
      • 2.Qxc5#
    • 1...Qe2
      • 2.Qxc5#
    • 1...Qg2
      • 2.Qxc5#
    • 1...Qh2
      • 2.Qd3#
      • 2.Qxc5#
    • 1...Qf3
      • 2.Qxc5#
    • 1...Qxf4
      • 2.Qxf4#
      • 2.Qxc5#
    • 1...Sxa6
      • 2.Qxd7#
    • 1...Sh6
      • 2.Qxf6#
    • 1...fxg6
      • 2.Qe6#
  • Tries
    • 1.Sxb8?
      • threat
        • 2.Rxd7#
        • 2.Qxd7#
      • 1...Qxf4
        • 2.Rxd7#
        • 2.Qxf4#
      • 1...Rxb8
        • 2.Qxd7#
      • 1...c4
        • 2.Rxd7#
      • 1...Kc7!
    • 1.Rxb8?
      • threat
        • 2.Qxd7#
      • 1...Qxf4
        • 2.Qxf4#
        • 2.Qxc5#
      • 1...Rxb8+!
    • 1.gxf7?
      • threat
        • 2.Qe6#
      • 1...Sxa6
        • 2.Qxd7#
      • 1...Qe1
        • 2.Qd3#
        • 2.Qxc5#
      • 1...Qa2
        • 2.Qxc5#
      • 1...Qe2
        • 2.Qxc5#
      • 1...Qe3!
  • Keys
    • 1.Qe4!
      • threat
        • 2.Sf5#
      • 1...Qxf4
        • 2.Qxf4#
      • 1...Sxa6
        • 2.Qxc6#
      • 1...fxg6
        • 2.Qe6#
      • 1...Sh6
        • 2.Qxe7#
      • 1...f5
        • 2.Sxf5#
        • 2.Qe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 8
  • Sets
    • Q(a);N_GUARD::QAB1(C),XP(b)
    • S(l);N_GUARD,P_PINR(G),XS(D)::QAR1(C),XP(h)
    • S(m);N_GUARD,P_PINB(I)::QAR2(C),XP(f)
    • P(j);N_GUARD,XP(E)::QAR1(C)
  • Tries
    • Try
      • S(D);XS(l)
      • Threat
        • DUALS(2)
      • Vars
        • R(k);P_PINR(G),XS(D)::QAR1(C),XP(h)
        • P(b);::R1(G),XP(h)
      • Refutation
        • K(e);N_SPINP(h),S_FLIGHT
    • Try
      • R(G);N_PINP(h),P_PINP(i),P_SPINR(G),XS(l)
      • Threat
        • QAR1(C),XP(h)
      • Refutation
        • R(k);CHECK,XR(G)
    • Try
      • P(E);XP(j)
      • Threat
        • QAR1(C)
      • Vars
        • S(l);N_GUARD,P_PINR(G),XS(D)::QAR1(C),XP(h)
        • Q(a);N_GUARD::QAB1(C),XP(b)
      • Refutation
        • Q(a);
  • Actual
    • Q(C);
    • Threat
      • S(F)
    • Vars
      • Q(a);OGATE,XP(B)::QAB(C),XQ(a)
      • S(l);N_GUARD,P_PINR(G),XS(D)::QAR1(C),XP(d)
      • P(j);N_GUARD,XP(E)::QAR1(C)
      • S(m);N_GUARD,P_PINB(I)::QAB1(C),XP(i)
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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).