MESON Chess Problem Database

Problem Display
PID: 208833 (2r2n2/1R4Qn/1Nk4K/1pB5/8/1N2p2P/r6p/6b1 w - - 0 1)

Barrier, ?

Detroit Free Press, 1876

2r2n2/1R4Qn/1Nk4K/1pB5/8/1N2p2P/r6p/6b1

#2

7 + 9

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Qg2#
    • 1...Rg2
      • 2.Qxg2#
    • 1...Ra3
      • 2.Qg2#
    • 1...Ra5
      • 2.Qg2#
    • 1...Ra6
      • 2.Qg2#
    • 1...Ra7
      • 2.Qg2#
    • 1...Raa8
      • 2.Qg2#
    • 1...Rc7
      • 2.Rxc7#
      • 2.Qxc7#
    • 1...Rca8
      • 2.Rc7#
      • 2.Qc7#
    • 1...Rb8
      • 2.Rc7#
      • 2.Qc7#
    • 1...Rd8
      • 2.Rc7#
      • 2.Qc7#
    • 1...Re8
      • 2.Rc7#
      • 2.Qc7#
    • 1...Bf2
      • 2.Qg2#
    • 1...Se6
      • 2.Qd7#
    • 1...Sg6
      • 2.Qd7#
    • 1...Sd7
      • 2.Qxd7#
    • 1...e2
      • 2.Qg2#
  • Tries
    • 1.Bxf8?
      • threat
        • 2.Sd4#
        • 2.Qd7#
      • 1...Rxf8
        • 2.Qc7#
        • 2.Qd7#
      • 1...Rc7
        • 2.Qxc7#
      • 1...Rd2
        • 2.Sa5#
      • 1...Ra4
        • 2.Qd7#
      • 1...Rd8
        • 2.Qc7#
      • 1...Sf6
        • 2.Sd4#
      • 1...e2
        • 2.Qg2#
        • 2.Qd7#
      • 1...Sxf8!
    • 1.Qe7?
      • threat
        • 2.Sd4#
        • 2.Qe4#
      • 1...Rc7
        • 2.Rxc7#
        • 2.Qe4#
        • 2.Qxc7#
      • 1...Sd7
        • 2.Qe4#
        • 2.Qxd7#
      • 1...b4
        • 2.Sd4#
      • 1...h1Q
        • 2.Sd4#
      • 1...h1B
        • 2.Sd4#
      • 1...Rd2
        • 2.Sa5#
      • 1...Rd8
        • 2.Rc7#
        • 2.Qc7#
      • 1...Re8
        • 2.Sd4#
        • 2.Rc7#
        • 2.Qc7#
      • 1...Sg5
        • 2.Sd4#
      • 1...Sf6
        • 2.Sd4#
      • 1...Se6
        • 2.Qd7#
      • 1...e2
        • 2.Qe4#
      • 1...Ra4!
  • Keys
    • 1.Bb4!
      • threat
        • 2.Sd4#
      • 1...Rc7
        • 2.Qxc7#
      • 1...Sd7
        • 2.Qxd7#
      • 1...Rd2
        • 2.Sa5#
      • 1...Rd8
        • 2.Qc7#
      • 1...Se6
        • 2.Qd7#
      • 1...e2
        • 2.Qg2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 9
  • Sets
    • R(b);N_GUARD::QAB(G)
    • R(b);N_GUARD::QAB(G),XR(b)
    • B(a);S_CUTR(b)::QAB(G)
    • S(i);N_GUARD::QAB1(G)
    • S(i);N_GUARD::QAB1(G),XS(i)
    • P(d);S_CUTR(b)::QAB(G)
  • Tries
    • Try
      • B(C);XS(i)
      • Threat
        • DUALS(2)
      • Vars
        • R(h);N_GUARD::QAR1(G),XR(h)
        • R(b);N_GUARD::S(A)
        • R(b);::QAB1(G)
        • R(h);N_GUARD::QAR1(G)
        • S(g);::S(A)
      • Refutation
        • S(g);XB(C)
    • Try
      • Q(G);
      • Threat
        • DUALS(2)
      • Vars
        • P(e);::S(A)
        • P(c);P_PINP(B)::S(A)
        • P(c);::S(A)
        • R(b);N_GUARD::S(A)
        • S(g);::S(A)
        • S(i);N_GUARD::QAB1(G)
        • P(d);::QAB(G)
      • Refutation
        • R(b);
  • Actual
    • B(C);
    • Threat
      • S(A)
    • Vars
      • R(h);N_GUARD::QAR1(G),XR(h)
      • S(i);N_GUARD::QAB1(G),XS(i)
      • R(b);N_GUARD::S(A)
      • R(h);N_GUARD::QAR1(G)
      • S(i);N_GUARD::QAB1(G)
      • P(d);S_CUTR(b)::QAB(G)
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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).