MESON Chess Problem Database

Problem Display
PID: 101443 (1N4nq/rp1N3p/3p4/3k1Bp1/6R1/8/rn2P1K1/Q5B1 w - - 0 1)

Sparke, Arthur M

Good Companions (October), 1916

1N4nq/rp1N3p/3p4/3k1Bp1/6R1/8/rn2P1K1/Q5B1

#2

8 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qd4
      • 2.Rxd4#
    • 1...Qe5
      • 2.Sb6#
    • 1...Sd1
      • 2.Sb6#
    • 1...Sd3
      • 2.Sb6#
    • 1...Sa4
      • 2.Qxa2#
    • 1...Sf6
      • 2.Rd4#
  • Tries
    • 1.Qd1+?
      • 1...Qd4
        • 2.Rxd4#
        • 2.Qxd4#
      • 1...Sd3
        • 2.Qb3#
      • 1...Sxd1!
    • 1.Qxa2+?
      • 1...Sc4
        • 2.Qxc4#
        • 2.e4#
      • 1...Rxa2!
  • Keys
    • 1.Rb4!
      • threat
        • 2.e4#
      • 1...Qd4
        • 2.Rxd4#
      • 1...Qe5
        • 2.Sb6#
      • 1...Sd1
        • 2.Sb6#
      • 1...Sd3
        • 2.Sb6#
      • 1...Sa4
        • 2.Qxa2#
      • 1...Sc4
        • 2.Rb5#
      • 1...Sf6
        • 2.Rd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • Q(j);N_GUARD::R1(E),XQ(j)
    • Q(j);SBLOCK::S(G)
    • S(b);P_PINP(C)::S(G)
    • S(b);N_GUARD,P_PINP(C),S_CUTR(f)::QAB(A),XR(a)
    • S(i);S_CUTQ(j)::R1(E)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • S(b);N_GUARD,P_PINP(C),P_SPINS(b)::QAB(A)
      • Refutation
        • S(b);P_PINP(C),XQ(A)
    • Try
      • Q(A);CHECK,XR(a)
      • Refutation
        • R(f);XQ(A)
  • Actual
    • R(E);
    • Threat
      • P(C)
    • Vars
      • Q(j);N_GUARD::R1(E),XQ(j)
      • Q(j);SBLOCK::S(G)
      • S(b);P_PINP(C)::S(G)
      • S(b);N_GUARD,P_PINP(C),S_CUTR(f)::QAB(A),XR(a)
      • S(b);P_PINP(C),SBLOCK::R(E)
      • S(i);S_CUTQ(j)::R1(E)
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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).