MESON Chess Problem Database

Problem Display
PID: 203435 (5NN1/1q2p3/1p2P3/pR1b3k/K4P2/p5PB/4r3/2nQn2R w - - 0 1)

ten Cate, Pieter

Oprechte Haarlemsche Courant, 1924

5NN1/1q2p3/1p2P3/pR1b3k/K4P2/p5PB/4r3/2nQn2R

#2

10 + 10

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qa6
      • 2.Rxd5#
    • 1...Qc8
      • 2.Rxd5#
    • 1...Qa7
      • 2.Rxd5#
  • Tries
    • 1.Sh6?
      • threat
        • 2.Bf1#
        • 2.Bg2#
        • 2.Bg4#
      • 1...Sg2
        • 2.Bxg2#
        • 2.Bg4#
      • 1...Sf3
        • 2.Bg4#
      • 1...Kxh6!
    • 1.Qxe2+?
      • 1...Sf3
        • 2.Bf5#
        • 2.Qxf3#
      • 1...Sxe2!
    • 1.Qxd5+?
      • 1...Re5
        • 2.Bf5#
        • 2.Qxe5#
      • 1...Qxd5!
  • Keys
    • 1.Qd4!
      • threat
        • 2.Qh8#
      • 1...Rxe6
        • 2.Bxe6#
      • 1...Re4
        • 2.Bf5#
      • 1...Re5
        • 2.Qxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • Q(i);N_GUARD,SBLOCK::R(G),XB(f)
    • Q(i);N_GUARD::R(G),XB(f)
  • Tries
    • Try
      • S(J);
      • Threat
        • DUALS(3)
      • Vars
        • S(b);N_SPINR(c)::R(B)+B(D),DCHECK
      • Refutation
        • K(g);N_SPINB(f),N_SPINR(c),P-FLIGHT,XS(J)
    • Try
      • Q(A);CHECK,XR(c)
      • Refutation
        • S(a);XQ(A)
    • Try
      • Q(A);CHECK,N_PINR(c),XB(f)
      • Refutation
        • Q(i);P_SPINQ(i),XQ(A)
  • Actual
    • Q(A);N_PINR(c)
    • Threat
      • QAR(A)
    • Vars
      • R(c);OGATE,XP(H)::R(B)+B(D),XR(c)
      • R(c);N_GUARD,P_PINQ(A)::R(B)+B(D)
      • R(c);N_GUARD,N_SPINB(f)::QAR(A),XR(c)
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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).