MESON Chess Problem Database

Problem Display
PID: 204391 (5RK1/1Bn5/6p1/3Np3/R1q1knr1/Q3p3/1B4p1/4Nbb1 w - - 0 1)

Rietveld, Johannes Jacob

L'Alfiere di Re, 1925

5RK1/1Bn5/6p1/3Np3/R1q1knr1/Q3p3/1B4p1/4Nbb1

#2

8 + 11

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qd4
      • 2.Sc3#
    • 1...Bh2
      • 2.Qxe3#
    • 1...Se2
      • 2.Qd3#
    • 1...Sd3
      • 2.Rxc4#
    • 1...Sfe6
      • 2.Sxc7#
    • 1...Sce6
      • 2.Sxf4#
    • 1...e2
      • 2.Qf3#
  • Tries
    • 1.Qd6?
      • threat
        • 2.Qxe5#
      • 1...Qd4
        • 2.Sc3#
      • 1...Sd3
        • 2.Rxc4#
      • 1...Rg5!
    • 1.Qd3+?
      • 1...Sxd3
        • 2.Rxc4#
      • 1...Bxd3!
  • Keys
    • 1.Qe7!
      • threat
        • 2.Qxe5#
      • 1...Qd4
        • 2.Sc3#
        • 2.Rxd4#
      • 1...Rg5
        • 2.Rxf4#
      • 1...Sd3
        • 2.Rxc4#
      • 1...Sfe6
        • 2.Sxc7#
      • 1...Sce6
        • 2.Sxf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • Q(e);N_PINS(E)::B(F)+S(E),DCHECK
    • B(b);N_GUARD::QAR1(C),XP(d)
    • S(g);N_GUARD,S_CUTB(a)::QAB1(C)
    • S(g);S_CUTB(a)::R(D),XQ(e)
    • S(g);N_PINS(E)::B(F)+S(E),XS(k)
    • S(k);N_PINS(E)::B(F)+S(E),XS(g)
    • P(d);OGATE::QAB1(C)
  • Tries
    • Try
      • Q(C);
      • Threat
        • QAR1(C),XP(i)
      • Vars
        • Q(e);N_PINS(E)::B(F)+S(E),DCHECK
        • S(g);S_CUTB(a)::R(D),XQ(e)
      • Refutation
        • R(h);
    • Try
      • Q(C);CHECK
      • Vars
        • S(g);XQ(C)::R(D),XQ(e)
      • Refutation
        • B(a);XQ(C)
  • Actual
    • Q(C);P_PINP(i)
    • Threat
      • QAR1(C),XP(i)
    • Vars
      • R(h);N_GUARD::R1(G),XS(g)
      • S(g);S_CUTB(a)::R(D),XQ(e)
      • S(g);N_PINS(E),N_SPINP(i)::B(F)+S(E),XS(k)
      • S(k);N_PINS(E),N_SPINP(i)::B(F)+S(E),XS(g)
HTML5 logo

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).