MESON Chess Problem Database

Problem Display
PID: 202480 (5bbq/4r1rp/3R3Q/2pN4/R3P1p1/3k4/KP1p4/3B1n2 w - - 0 1)

ten Cate, Pieter

Australasian (The), 1923

5bbq/4r1rp/3R3Q/2pN4/R3P1p1/3k4/KP1p4/3B1n2

#2

8 + 11

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Ref7
      • 2.Se7#
    • 1...Rgf7
      • 2.Sf6#
    • 1...Bxd5+
      • 2.Rxd5#
    • 1...Sh2
      • 2.Qe3#
    • 1...Se3
      • 2.Qxe3#
    • 1...Sg3
      • 2.Qe3#
  • Tries
    • 1.Be2+?
      • 1...Kc2
        • 2.Rc4#
      • 1...Kxe2!
    • 1.Qh3+?
      • 1...Se3
        • 2.Qxe3#
      • 1...Sg3
        • 2.Qxg3#
      • 1...g3
        • 2.Qxf1#
      • 1...gxh3!
  • Keys
    • 1.Qf4!
      • threat
        • 2.Qxf1#
      • 1...Bxd5+
        • 2.Rxd5#
      • 1...Rxe4
        • 2.Qxe4#
      • 1...c4
        • 2.Sb4#
      • 1...Ref7
        • 2.Se7#
      • 1...Rgf7
        • 2.Sf6#
      • 1...Sh2
        • 2.Qe3#
      • 1...Se3
        • 2.Qxe3#
      • 1...Sg3
        • 2.Qe3#
        • 2.Qxg3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • R(f);N_PINS(F)::R(G)+S(F)
    • R(g);N_PINS(F)::R(G)+S(F)
    • B(j);CHECK,OGATE,P_SPINB(j),XS(F)::R(G),XB(j)
    • S(a);N_GUARD::QAR1(H)
    • S(a);N_GUARD::QAR1(H),XS(a)
  • Tries
    • Try
      • B(A);CHECK
      • Vars
        • K(c);S_FLIGHT::R(D)
      • Refutation
        • K(c);S_FLIGHT,XB(A)
    • Try
      • Q(H);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAR1(H),XS(a)
        • S(a);N_GUARD,P_SPINS(a)::QAR(H),XS(a)
        • P(d);P_SPINP(d)::QAB(H),XS(a)
      • Refutation
        • P(d);XQ(H)
  • Actual
    • Q(H);
    • Threat
      • QAB(H),XS(a)
    • Vars
      • B(j);CHECK,OGATE,P_SPINB(j),XS(F)::R(G),XB(j)
      • R(f);OGATE,XP(E)::QAB1(H),XR(f)
      • P(e);N_PINS(F),SBLOCK::R(G)+S(F),DCHECK
      • R(f);N_PINS(F)::R(G)+S(F)
      • R(g);N_PINS(F)::R(G)+S(F)
      • S(a);N_GUARD::QAR1(H)
      • S(a);N_GUARD::QAR1(H),XS(a)
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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).