MESON Chess Problem Database

Problem Display
PID: 19041 (8/8/1R2N3/3k1p2/rR6/p3p3/K1Nr3p/BB1Qb2q w - - 0 1)

Pirnie, Duncan

Southern Daily Post, 1911

8/8/1R2N3/3k1p2/rR6/p3p3/K1Nr3p/BB1Qb2q

#2

8 + 9

1842 The White King 1914

SOLUTION

  • SOUND
  • Sets
    • 1...Qf3
      • 2.Qxf3#
    • 1...Qg1
      • 2.Qf3#
    • 1...Rxd1
      • 2.Sxe3#
    • 1...Rd3
      • 2.Sxe3#
      • 2.Qxd3#
    • 1...Rd4
      • 2.Qxd4#
    • 1...Bf2
      • 2.Qxh1#
    • 1...f4
      • 2.Qh5#
  • Tries
    • 1.Qxd2+?
      • 1...exd2
        • 2.Se3#
      • 1...Bxd2!
  • Keys
    • 1.Kb3!
      • threat
        • 2.Sxe3#
      • 1...Rd3+
        • 2.Qxd3#
      • 1...Rxb4+
        • 2.Sxb4#
      • 1...Rd4
        • 2.Qxd4#
      • 1...Qf3
        • 2.Qxf3#
      • 1...Qe4
        • 2.R4b5#
      • 1...Qg1
        • 2.Qf3#
      • 1...Bf2
        • 2.Qxh1#
      • 1...e2
        • 2.Se3#
      • 1...f4
        • 2.Qh5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • Q(b);N_GUARD::QAB(C),XQ(b)
    • Q(b);N_GUARD::QAB(C)
    • R(c);N_PINS(E),N_SPINR(c),XQ(C)::S(E),XP(f)
    • R(c);N_PINS(E),OGATE::QAR1(C),XR(c)
    • B(a);OGATE::QAB(C),XQ(b)
    • P(i);OGATEB::QAR(C)
  • Tries
    • Try
      • Q(C);CHECK,N_SPINS(E),XR(c)
      • Vars
        • P(f);XQ(C)::S(E)
      • Refutation
        • B(a);XQ(C)
  • Actual
    • K(D);N_SPINS(E),S_FLIGHT
    • Threat
      • S(E),XP(f)
    • Vars
      • R(c);CHECK,OGATE::QAR2(C),XR(c)
      • R(g);CHECK,XR(F)::S(E),XR(g)
      • R(c);OGATE::QAR1(C),XR(c)
      • Q(b);N_GUARD::QAB(C),XQ(b)
      • Q(b);SBLOCK::R(F)
      • Q(b);N_GUARD::QAB(C)
      • B(a);OGATE::QAB(C),XQ(b)
      • P(f);::S(E)
      • P(i);OGATEB::QAR(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).