MESON Chess Problem Database

Problem Display
PID: 250043 (4r1B1/1p1Q4/p5n1/1R1q1N1K/P1k2bp1/1pp1p3/2PrN3/7b w - - 0 1)

Heidrich, Gerhard

3rd Prize, Berliner Arbeiter Schachklub, 1927

4r1B1/1p1Q4/p5n1/1R1q1N1K/P1k2bp1/1pp1p3/2PrN3/7b

#2

8 + 13

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qe6
      • 2.cxb3#
    • 1...Qf7
      • 2.cxb3#
    • 1...Qxg8
      • 2.cxb3#
    • 1...Rd3
      • 2.cxb3#
    • 1...Re5
      • 2.Qc8#
      • 2.Qc7#
    • 1...Be5
      • 2.Sxe3#
    • 1...Bg5
      • 2.Sd6#
      • 2.Qc7#
    • 1...Bh6
      • 2.Qc7#
    • 1...Bc7
      • 2.Qxc7#
    • 1...Se5
      • 2.Sd6#
    • 1...axb5
      • 2.Qxb5#
    • 1...b6
      • 2.Qc6#
  • Tries
    • 1.Qc8+?
      • 1...Bc7
        • 2.Qxc7#
      • 1...Rxc8!
  • Keys
    • 1.Qg7!
      • threat
        • 2.Qxc3#
      • 1...Rxc2
        • 2.Qd4#
      • 1...Rxe2
        • 2.Qd4#
      • 1...Rd3
        • 2.cxb3#
      • 1...Rd4
        • 2.Qxd4#
      • 1...Re5
        • 2.Qc7#
      • 1...Be5
        • 2.Sxe3#
      • 1...Se5
        • 2.Sd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 7
  • Sets
    • Q(i);N_PINS(E)::P(A),XP(c)
    • Q(i);N_PINS(E),N_SPINQ(i),XB(H)::P(A),XP(c)
    • R(b);SBLOCK::P(A),XP(c)
    • B(g);N_PINS(E)::S(E),XP(e)
    • B(g);N_GUARD::QAR(G)
    • B(g);N_GUARD::QAR(G),XB(g)
    • S(k);N_PINS(E)::S(E)
    • P(j);OGATE,XR(D)::QAB1(G),XP(j)
    • P(l);N_GUARD::QAR2(G)
  • Tries
    • Try
      • Q(G);CHECK
      • Vars
        • B(g);N_GUARD,P_SPINB(g)::QAR(G),XB(g)
      • Refutation
        • R(m);XQ(G)
  • Actual
    • Q(G);
    • Threat
      • QAR1(G),XP(d)
    • Vars
      • R(b);N_GUARD,XP(A)::QAR1(G)
      • R(b);N_GUARD,XS(B)::QAR1(G)
      • R(b);SBLOCK::P(A),XP(c)
      • R(b);N_GUARD::QAR1(G),XR(b)
      • R(m);S_CUTB(g)::QAR(G)
      • B(g);N_PINS(E)::S(E),XP(e)
      • S(k);N_PINS(E)::S(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).