MESON Chess Problem Database

Problem Display
PID: 270940 (3R4/4p1Kp/p1B1p3/4k1pr/3p3N/2r4N/nn2b3/4Q3 w - - 0 1)

Kofman, Rafael Moiseevich

Die Schwalbe, 1931

3R4/4p1Kp/p1B1p3/4k1pr/3p3N/2r4N/nn2b3/4Q3

#2

6 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Rc1
      • 2.Qg3#
      • 2.Qxe2#
    • 1...Rc2
      • 2.Qg3#
    • 1...Rd3
      • 2.Qa5#
    • 1...Rg3
      • 2.Qxg3#
    • 1...Rc4
      • 2.Qg3#
      • 2.Qxe2#
    • 1...Rc5
      • 2.Qg3#
      • 2.Qxe2#
    • 1...Rxc6
      • 2.Qxe2#
    • 1...Sd3
      • 2.Qxe2#
    • 1...d3
      • 2.Qg3#
  • Keys
    • 1.Qd2!
      • threat
        • 2.Qxd4#
      • 1...Rxh4
        • 2.Qxg5#
      • 1...gxh4
        • 2.Qf4#
      • 1...Rd3
        • 2.Qa5#
      • 1...Rc4
        • 2.Qxe2#
      • 1...Bd3
        • 2.Qh2#
      • 1...Sd3
        • 2.Qxe2#
      • 1...d3
        • 2.Qe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • R(d);N_GUARD::QAB(A)
    • R(d);OGATE::QAR(A)
    • R(d);N_GUARD::QAB(A),XR(d)
    • R(d);N_GUARD,XB(D)::QAR(A),XB(c)
    • S(b);S_CUTR(d)::QAR(A),XB(c)
    • P(e);S_CUTR(d)::QAB(A)
  • Actual
    • Q(A);N_PINB(c)
    • Threat
      • QAB1(A),XP(e)
    • Vars
      • R(h);N_GUARD,XS(C)::QAR2(A),XP(g)
      • P(g);N_GUARD,XS(C)::QAB1(A)
      • R(d);OGATE::QAR(A)
      • R(d);N_GUARD::QAR(A),XB(c)
      • B(c);OGATE::QAB(A)
      • S(b);S_CUTR(d)::QAR(A),XB(c)
      • P(e);N_GUARD,S_CUTR(d)::QAR2(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).