MESON Chess Problem Database

Problem Display
PID: 57330 (n4B2/1r2p1RK/2pPBP2/P1k2N1R/7P/2Np2P1/1Q3n1q/rb6 w - - 0 1)

Beach, Lennox F

4th HM., Brisbane Courier, 1919

n4B2/1r2p1RK/2pPBP2/P1k2N1R/7P/2Np2P1/1Q3n1q/rb6

#2

13 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Ra4
      • 2.Sxa4#
    • 1...Ba2
      • 2.Sa4#
    • 1...Sd1
      • 2.Se4#
    • 1...Sh1
      • 2.Se4#
    • 1...Sh3
      • 2.Se4#
    • 1...Se4
      • 2.Sxe4#
    • 1...Sg4
      • 2.Se4#
    • 1...exd6
      • 2.Bxd6#
    • 1...exf6
      • 2.d7#
  • Keys
    • 1.Rg4!
      • threat
        • 2.Rc4#
      • 1...exd6+
        • 2.Sg7#
      • 1...exf6+
        • 2.d7#
      • 1...Qxh4
        • 2.Qxf2#
      • 1...Sxg4
        • 2.Se4#
      • 1...Ra4
        • 2.Sxa4#
      • 1...Rb4
        • 2.Qxb4#
      • 1...Ba2
        • 2.Sa4#
      • 1...Se4
        • 2.Sxe4#
      • 1...Sb6
        • 2.Qb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • R(a);N_GUARD::S(B),XR(a)
    • B(b);S_CUTR(a)::S(B)
    • S(c);N_GUARD::S(B)
    • S(c);N_GUARD::S(B),XS(c)
    • P(i);OGATE,P_PINR(K),P_SPINP(i),XP(H)::B(M),XP(i)
    • P(i);P_PINR(K),XP(J)::B(M)+P(H)
  • Actual
    • R(K);
    • Threat
      • R1(K)
    • Vars
      • P(i);CHECK,P_SPINP(i),XP(H)::R(G)+S(F)
      • P(i);CHECK,XP(J)::B(M)+P(H)
      • Q(d);N_GUARD,P_PINR(G),XP(D)::QAB(A),XS(c)
      • S(c);N_GUARD,XR(K)::S(B)
      • R(a);N_GUARD::S(B),XR(a)
      • R(h);N_GUARD::QAB1(A),XR(h)
      • B(b);S_CUTR(a)::S(B)
      • S(c);N_GUARD::S(B),XS(c)
      • S(j);S_CUTR(h)::QAB1(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).