MESON Chess Problem Database

Problem Display
PID: 187806 (1N4B1/4R1K1/1P1pPp2/3k4/q2P4/p2Q1b2/2P1P3/8 w - - 0 1)

Nielsen, Kristian

The Times, 1909

1N4B1/4R1K1/1P1pPp2/3k4/q2P4/p2Q1b2/2P1P3/8

#2

10 + 6

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qd7
      • 2.c4#
      • 2.exd7#
    • 1...Qe8
      • 2.c4#
    • 1...Qa5
      • 2.c4#
    • 1...Qa7
      • 2.c4#
    • 1...Qa8
      • 2.c4#
    • 1...Bg4
      • 2.e4#
    • 1...Bh5
      • 2.e4#
  • Tries
    • 1.Rb7?
      • threat
        • 2.e7#
      • 1...Qd7+
        • 2.exd7#
      • 1...Qe8
        • 2.c4#
      • 1...Bg4
        • 2.e4#
      • 1...Bh5
        • 2.e4#
      • 1...Qxd4!
    • 1.Rc7?
      • threat
        • 2.e7#
      • 1...Qd7+
        • 2.exd7#
      • 1...Qe8
        • 2.c4#
      • 1...Bg4
        • 2.e4#
      • 1...Bh5
        • 2.e4#
      • 1...Qxd4!
    • 1.Rd7?
      • threat
        • 2.e7#
      • 1...Qxd7+
        • 2.exd7#
      • 1...Bg4
        • 2.e4#
      • 1...Bh5
        • 2.e4#
      • 1...Qxd4!
    • 1.Re8?
      • threat
        • 2.e7#
      • 1...Qd7+
        • 2.exd7#
      • 1...Qxe8
        • 2.c4#
      • 1...Bg4
        • 2.e4#
      • 1...Bh5
        • 2.e4#
      • 1...Qxd4!
  • Keys
    • 1.Ra7!
      • threat
        • 2.e7#
      • 1...Qd7+
        • 2.exd7#
      • 1...Qxd4
        • 2.Ra5#
      • 1...Qe8
        • 2.c4#
      • 1...Bg4
        • 2.e4#
      • 1...Bh5
        • 2.e4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • Q(c);N_GUARD::P(A)
    • Q(c);N_GUARD,P_PINR(G)::P(A)
    • B(b);N_GUARD::P(B)
  • Tries
    • Try
      • R(G);
      • Threat
        • B(J)+P(F)
      • Vars
        • Q(c);CHECK,OGATE::B(J)+P(F),XQ(c)
        • Q(c);N_GUARD::P(A)
        • B(b);N_GUARD::P(B)
      • Refutation
        • Q(c);P_SPINQ(c),XP(D)
    • Try
      • R(G);
      • Threat
        • B(J)+P(F)
      • Vars
        • Q(c);CHECK,OGATE::B(J)+P(F),XQ(c)
        • Q(c);N_GUARD::P(A)
        • B(b);N_GUARD::P(B)
      • Refutation
        • Q(c);P_SPINQ(c),XP(D)
    • Try
      • R(G);P_PINP(e)
      • Threat
        • B(J)+P(F)
      • Vars
        • Q(c);CHECK,N_SPINP(e),OGATE,XR(G)::B(J)+P(F),XQ(c)
        • B(b);N_GUARD::P(B)
      • Refutation
        • Q(c);P_SPINQ(c),XP(D)
    • Try
      • R(G);
      • Threat
        • B(J)+P(F)
      • Vars
        • Q(c);CHECK,OGATE::B(J)+P(F),XQ(c)
        • Q(c);N_GUARD,XR(G)::P(A)
        • B(b);N_GUARD::P(B)
      • Refutation
        • Q(c);P_SPINQ(c),XP(D)
  • Actual
    • R(G);
    • Threat
      • B(J)+P(F)
    • Vars
      • Q(c);CHECK,OGATE::B(J)+P(F),XQ(c)
      • Q(c);N_GUARD,P_SPINQ(c),XP(D)::R(G)
      • Q(c);N_GUARD::P(A)
      • B(b);N_GUARD::P(B)
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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).