MESON Chess Problem Database

Problem Display
PID: 272888 (B7/2p5/1q2bPn1/pN1N2Q1/Rp1pk1P1/1K3p2/1PPR4/8 w - - 0 1)

Lukkarinen, Heikki

Schackvarlden, 1941

B7/2p5/1q2bPn1/pN1N2Q1/Rp1pk1P1/1K3p2/1PPR4/8

#2

11 + 9

15601 Albrecht-Leiss-Degener Collection 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Qa6
      • 2.Rxd4#
    • 1...Qc6
      • 2.Rxd4#
    • 1...Qd6
      • 2.Rxd4#
    • 1...Qb7
      • 2.Rxd4#
    • 1...Qb8
      • 2.Rxd4#
    • 1...Bxg4
      • 2.Sdc3#
    • 1...Bxd5+
      • 2.Bxd5#
    • 1...Bf5
      • 2.Qxf5#
    • 1...Bd7
      • 2.Sdc3#
    • 1...Bf7
      • 2.Qf5#
    • 1...Bc8
      • 2.Sdc3#
    • 1...Bg8
      • 2.Qf5#
    • 1...Sf4
      • 2.Qxf4#
    • 1...Sh4
      • 2.Qf4#
    • 1...Se5
      • 2.Qf4#
    • 1...Se7
      • 2.Qf4#
    • 1...Sf8
      • 2.Qf4#
    • 1...Sh8
      • 2.Qf4#
    • 1...d3
      • 2.cxd3#
    • 1...c6
      • 2.Sd6#
  • Tries
    • 1.Qxg6+?
      • 1...Bf5
        • 2.Qxf5#
      • 1...Ke5!
  • Keys
    • 1.c4!
      • threat
        • 2.Sdc3#
      • 1...Bxd5
        • 2.Bxd5#
      • 1...bxc4 ep
        • 2.Qe3#
      • 1...dxc4 ep
        • 2.Sxc3#
      • 1...Bf5
        • 2.Qxf5#
      • 1...Qc6
        • 2.Rxd4#
      • 1...Qb7
        • 2.Rxd4#
      • 1...Sf4
        • 2.Qxf4#
      • 1...c6
        • 2.Sd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 14
  • Sets
    • Q(f);N_GUARD::R1(C),XP(c)
    • B(g);N_PINS(H),XP(F)::B(K)+S(H),DCHECK
    • B(g);CHECK,OGATE,P_SPINB(g),XS(H)::B(K),XB(g)
    • B(g);N_GUARD,N_PINS(H)::QAB1(I),XB(g)
    • B(g);N_PINS(H)::B(K)+S(H),DCHECK
    • B(g);N_GUARD::QAB1(I)
    • S(h);N_GUARD::QAR1(I),XS(h)
    • S(h);N_GUARD::QAR1(I)
    • P(c);OGATE,P_SPINP(b)::P(B),XP(c)
    • P(i);N_GUARD,S_CUTQ(f)::S(G)
  • Tries
    • Try
      • Q(I);CHECK,XS(h)
      • Vars
        • B(g);N_GUARD,N_PINS(H),P_SPINB(g)::QAB1(I),XB(g)
      • Refutation
        • K(d);P-FLIGHT
  • Actual
    • P(B);N_SPINS(H)
    • Threat
      • B(K)+S(H),DCHECK
    • Vars
      • B(g);OGATE,P_PINP(B),P_SPINB(g),XS(H)::B(K),XB(g)
      • P(b);EP,P_PINS(G),P_SPINP(c),XP(B)::QAR1(I)
      • P(c);EP,N_GUARD,P_PINS(H),P_SPINP(b),XP(B)::S(G),XP(c)
      • B(g);N_GUARD::QAB1(I),XB(g)
      • Q(f);N_GUARD::R1(C),XP(c)
      • S(h);N_GUARD::QAR1(I),XS(h)
      • P(i);N_GUARD,S_CUTQ(f)::S(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).