MESON Chess Problem Database

Problem Display
PID: 94611 (4rB2/1p1rq3/5R2/n1k1Nb1R/BN3Q2/1P1pK3/8/8 w - - 0 1)

Pedersen, Eigil Palle

Magasinet, 1944

4rB2/1p1rq3/5R2/n1k1Nb1R/BN3Q2/1P1pK3/8/8

#2

9 + 8

6490 yacpdb 2009
5454 Near Snap 2011

SOLUTION

  • SOUND
  • Sets
    • 1...Qd6
      • 2.Qd4#
    • 1...Rd4
      • 2.Qxd4#
    • 1...Rc7
      • 2.Qd4#
    • 1...Be4
      • 2.Sexd3#
    • 1...Be6
      • 2.Sxd7#
    • 1...Sxb3
      • 2.Qc4#
    • 1...Sc4+
      • 2.Qxc4#
  • Tries
    • 1.Sa6+?
      • 1...Kd5
        • 2.Qd4#
      • 1...bxa6!
    • 1.Bxe7+?
      • 1...Rd6
        • 2.Sd7#
        • 2.Qd4#
      • 1...Rdxe7
        • 2.Qd4#
      • 1...Rexe7!
  • Keys
    • 1.Sd5!
      • threat
        • 2.Qd4#
      • 1...Sc4+
        • 2.Qxc4#
      • 1...Kxd5
        • 2.Qd4#
      • 1...Rxd5
        • 2.b4#
      • 1...Sxb3
        • 2.Qc4#
      • 1...Be6
        • 2.Sxd3#
      • 1...Be4
        • 2.Sxd7#
      • 1...Sc6
        • 2.Qc4#

Anticipated by 71387(1928), 6859(1934)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • Q(g);S_CUTR(f)::QAB1(E)
    • R(f);N_GUARD::QAB1(E),XR(f)
    • R(f);N_GUARD::QAB1(E)
    • B(d);N_PINS(F)::R(G)+S(F),DCHECK,XP(a)
    • B(d);N_PINS(F)::R(G)+S(F),DCHECK,XR(f)
    • S(b);N_GUARD,XP(A)::QAR1(E)
    • S(b);CHECK,N_GUARD::QAR1(E),XS(b)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • K(c);N_SPINQ(g),P-FLIGHT::QAR1(E)
      • Refutation
        • P(e);XS(D)
    • Try
      • B(I);CHECK,N_SPINS(F),XQ(g)
      • Vars
        • R(f);P_PINS(F),XB(I)::QAB1(E)
      • Refutation
        • R(h);P_PINS(F),XB(I)
  • Actual
    • S(D);
    • Threat
      • QAB1(E)
    • Vars
      • S(b);CHECK,N_GUARD::QAR1(E),XS(b)
      • K(c);N_SPINQ(g),P-FLIGHT,XS(D)::QAR1(E)
      • R(f);SBLOCK,XS(D)::P(A)
      • S(b);N_GUARD,XP(A)::QAR1(E)
      • B(d);N_PINS(F)::S(F),XP(a)
      • B(d);N_PINS(F)::S(F),XR(f)
      • S(b);N_GUARD::QAR1(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).