MESON Chess Problem Database

Problem Display
PID: 49585 (4r3/b7/2p1nq2/N2p1R1B/br4N1/1n1kpQp1/1BR2P2/3K4 w - - 0 1)

Ekstrom, Sven Johan Adrian

2nd Prize, Schackvarlden, 1941

4r3/b7/2p1nq2/N2p1R1B/br4N1/1n1kpQp1/1BR2P2/3K4

#2

9 + 12

461 Schach-Express 1950

SOLUTION

  • SOUND
  • Sets
    • 1...Qh4
      • 2.Se5#
    • 1...Qe5
      • 2.Sxe5#
    • 1...Qg5
      • 2.Se5#
    • 1...Qe7
      • 2.Se5#
    • 1...Qd8
      • 2.Se5#
    • 1...Qg6
      • 2.Se5#
    • 1...Qh6
      • 2.Se5#
    • 1...Qf7
      • 2.Se5#
    • 1...Qf8
      • 2.Se5#
    • 1...Rd4
      • 2.Rc3#
      • 2.Qxe3#
    • 1...Re4
      • 2.Qe2#
    • 1...Rb6
      • 2.Qxe3#
    • 1...Bb8
      • 2.Qxe3#
    • 1...Sbd4
      • 2.Qxe3#
    • 1...Sbc5
      • 2.Qxe3#
    • 1...Sed4
      • 2.Rc3#
    • 1...gxf2
      • 2.Sxf2#
    • 1...c5
      • 2.Qxe3#
  • Tries
    • 1.Rc3+?
      • 1...Kd4
        • 2.Qxe3#
        • 2.fxe3#
      • 1...Qxc3!
    • 1.Rxd5+?
      • 1...Qd4
        • 2.Se5#
        • 2.Bg6#
        • 2.Rc3#
        • 2.Qxe3#
        • 2.Qf5#
      • 1...Rd4
        • 2.Rc3#
        • 2.Qxe3#
      • 1...Bd4
        • 2.Rc3#
        • 2.Qxe3#
      • 1...Sbd4
        • 2.Qxe3#
      • 1...Sed4
        • 2.Rc3#
      • 1...cxd5!
  • Keys
    • 1.Bg6!
      • threat
        • 2.Rxd5#
      • 1...Qxf5
        • 2.Se5#
      • 1...Qxg6
        • 2.Se5#
      • 1...Qe5
        • 2.Sxe5#
      • 1...Rd4
        • 2.Rc3#
        • 2.Qxe3#
      • 1...Re4
        • 2.Qe2#
      • 1...Bd4
        • 2.Rxf6#
      • 1...Sbd4
        • 2.Qxe3#
      • 1...Sed4
        • 2.Rc3#
      • 1...d4
        • 2.Rxf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 12
  • Sets
    • Q(j);N_GUARD::S(F)
    • Q(j);N_GUARD::S(F),XQ(j)
    • R(f);SBLOCK::QAB1(E)
    • R(f);S_CUTB(k)::QAR1(E),XP(c)
    • B(k);N_GUARD::QAR1(E),XP(c)
    • S(a);P_PINR(C),S_CUTB(k)::QAR1(E),XP(c)
    • S(i);SBLOCK,S_CUTQ(j)::R1(C)
    • P(d);XP(D)::S(F),XP(d)
    • P(h);S_CUTB(k)::QAR1(E),XP(c)
  • Tries
    • Try
      • R(C);CHECK
      • Refutation
        • Q(j);XR(C)
    • Try
      • R(H);CHECK,XP(g)
      • Vars
        • S(a);P_PINR(C),P_SPINS(a)::QAR1(E),XP(c)
        • S(i);P_SPINS(i)::R1(C)
      • Refutation
        • P(h);XR(H)
  • Actual
    • B(I);
    • Threat
      • B(I)+R(H),DCHECK,XP(g)
    • Vars
      • Q(j);N_GUARD,P_SPINQ(j),XR(H)::S(F)
      • Q(j);N_GUARD,XB(I)::S(F)
      • Q(j);N_GUARD::S(F),XQ(j)
      • R(f);SBLOCK::QAB1(E)
      • B(k);S_CUTR(f)::B(I)+R(H),XQ(j)
      • S(a);P_PINR(C),S_CUTB(k)::QAR1(E),XP(c)
      • S(i);SBLOCK,S_CUTQ(j)::R1(C)
      • P(g);S_CUTR(f)::B(I)+R(H),XQ(j)
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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).