MESON Chess Problem Database

Problem Display
PID: 203330 (7b/5n2/R6p/1N4nr/1k2qQ2/4Bb2/PP6/2R1KB2 w - - 0 1)

Rietveld, Johannes Jacob

2nd Prize, Tijdschrift van den Nederlandsch-Indischen Schaakbond, 1924

7b/5n2/R6p/1N4nr/1k2qQ2/4Bb2/PP6/2R1KB2

#2

9 + 8

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qc4
      • 2.Qxc4#
    • 1...Qd4
      • 2.Bd2#
    • 1...Qxf4
      • 2.Bc5#
    • 1...Bc3+
      • 2.bxc3#
    • 1...Se5
      • 2.Qf8#
    • 1...Sd6
      • 2.Qxd6#
    • 1...Sd8
      • 2.Qd6#
  • Tries
    • 1.Rc3?
      • threat
        • 2.Rb3#
        • 2.a3#
      • 1...Bxc3+
        • 2.bxc3#
      • 1...Qc4
        • 2.Rb3#
        • 2.Qxc4#
      • 1...Qd4
        • 2.a3#
      • 1...Bd1
        • 2.a3#
      • 1...Bd4
        • 2.a3#
      • 1...Be2!
    • 1.Rc4+?
      • 1...Qxc4
        • 2.Qxc4#
      • 1...Kxb5!
    • 1.Qxe4+?
      • 1...Bxe4
        • 2.Bc5#
      • 1...Bd4
        • 2.Bd2#
        • 2.Qxd4#
      • 1...Sxe4!
  • Keys
    • 1.Sa7!
      • threat
        • 2.Sc6#
      • 1...Bc3+
        • 2.bxc3#
      • 1...Qxf4
        • 2.Bc5#
      • 1...Qc4
        • 2.Rxc4#
        • 2.Qxc4#
      • 1...Qd4
        • 2.Bd2#
      • 1...Be2
        • 2.Bc5#
      • 1...Bd4
        • 2.Rc4#
      • 1...Se5
        • 2.Qf8#
      • 1...Sd8
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • Q(c);N_PINB(F),OGATE::QAR1(G),XQ(c)
    • Q(c);N_PINB(F)::B(F)
    • Q(c);N_PINB(F),N_SPINQ(c),XQ(G)::B(F)
    • B(h);CHECK,OGATE::P(E),XB(h)
    • S(g);OGATE::QAB(G)
    • S(g);N_GUARD::QAB(G),XS(g)
    • S(g);N_GUARD::QAB(G)
  • Tries
    • Try
      • R(A);
      • Threat
        • DUALS(2)
      • Vars
        • B(h);CHECK,OGATE,XR(A)::P(E),XB(h)
        • Q(c);N_PINB(F)::P(D)
        • B(a);::P(D)
        • B(h);N_SPINQ(c)::P(D)
      • Refutation
        • B(a);N_PINB(F)
    • Try
      • R(A);CHECK,N_PINQ(c)
      • Vars
        • Q(c);N_PINB(F),OGATE,P_SPINQ(c),XR(A)::QAR1(G),XQ(c)
      • Refutation
        • K(b);P-FLIGHT,XS(H)
    • Try
      • Q(G);CHECK,N_SPINB(F),XQ(c)
      • Vars
        • B(a);XQ(G)::B(F)
      • Refutation
        • S(d);XQ(G)
  • Actual
    • S(H);
    • Threat
      • S(H)
    • Vars
      • B(h);CHECK,OGATE::P(E),XB(h)
      • Q(c);N_PINB(F),N_SPINQ(c),XQ(G)::B(F)
      • Q(c);N_PINB(F)::B(F)
      • B(a);N_PINB(F)::B(F)
      • B(h);N_SPINQ(c),S_CUTQ(c)::R1(A)
      • S(g);OGATE::QAB(G)
      • S(g);N_GUARD::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).