MESON Chess Problem Database

Problem Display
PID: 101346 (7q/2Pn1N2/8/Qp3p2/1R1P1kP1/p6P/3pP1n1/KB2bN2 w - - 0 1)

Hartong, Jan

Good Companions, 1919

7q/2Pn1N2/8/Qp3p2/1R1P1kP1/p6P/3pP1n1/KB2bN2

#2

11 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd4+
      • 2.Rxd4#
    • 1...Qe5
      • 2.dxe5#
    • 1...Qxh3
      • 2.d5#
    • 1...Qh4
      • 2.d5#
    • 1...Qh5
      • 2.d5#
    • 1...Qh6
      • 2.d5#
    • 1...Qh7
      • 2.d5#
    • 1...Qa8
      • 2.d5#
    • 1...Qb8
      • 2.d5#
    • 1...Qc8
      • 2.d5#
    • 1...Qd8
      • 2.d5#
    • 1...Qg8
      • 2.d5#
    • 1...Se5
      • 2.dxe5#
  • Tries
    • 1.Qxa3?
      • threat
        • 2.Qf3#
      • 1...Qxd4+
        • 2.Rxd4#
      • 1...Qxh3
        • 2.d5#
      • 1...Qa8
        • 2.d5#
      • 1...Se3
        • 2.Qxe3#
      • 1...Sh4
        • 2.Qe3#
      • 1...Se5
        • 2.dxe5#
      • 1...fxg4!
  • Keys
    • 1.Qa8!
      • threat
        • 2.Qf3#
      • 1...Qxd4+
        • 2.Rxd4#
      • 1...Qxh3
        • 2.d5#
      • 1...Qxa8
        • 2.d5#
      • 1...fxg4
        • 2.Qe4#
      • 1...Sh4
        • 2.e3#
      • 1...Se5
        • 2.dxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 9
  • Sets
    • Q(i);CHECK,OGATE,P_SPINQ(i),XP(G)::R(F),XQ(i)
    • Q(i);::R(F)+P(G),XQ(i)
    • Q(i);N_PINP(G),XP(E)::R(F)+P(G)
    • Q(i);N_PINP(G)::R(F)+P(G)
    • S(h);N_PINP(G)::R(F)+P(G),XS(h)
  • Tries
    • Try
      • Q(I);XP(d)
      • Threat
        • QAR1(I)
      • Vars
        • Q(i);CHECK,OGATE,P_SPINQ(i),XP(G)::R(F),XQ(i)
        • Q(i);N_PINP(G),XP(E)::R(F)+P(G)
        • Q(i);N_PINP(G),P_PINQ(I)::R(F)+P(G)
        • S(c);N_GUARD::QAB1(I),XS(c)
        • S(c);N_GUARD::QAB1(I)
        • S(h);N_PINP(G)::R(F)+P(G),XS(h)
      • Refutation
        • P(g);XP(H)
  • Actual
    • Q(I);
    • Threat
      • QAR1(I)
    • Vars
      • Q(i);CHECK,OGATE,P_SPINQ(i),XP(G)::R(F),XQ(i)
      • Q(i);N_PINP(G),XP(E)::R(F)+P(G)
      • Q(i);N_PINP(G),XQ(I)::R(F)+P(G)
      • P(g);N_GUARD,XP(H)::QAR1(I)
      • S(c);N_GUARD::P(D)
      • S(h);N_PINP(G)::R(F)+P(G),XS(h)
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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).