MESON Chess Problem Database

Problem Display
PID: 11591 (1N1B2K1/2nNb1p1/R2Pk1n1/p1p4p/r4R2/1b3Q2/5p2/2r2q1B w - - 0 1)

Sammelius, Carel Johan Robert

1st Prize, Tijdschrift vd KNSB 16. TT, 1939

1N1B2K1/2nNb1p1/R2Pk1n1/p1p4p/r4R2/1b3Q2/5p2/2r2q1B

#2

9 + 13

3098 FIDE Album (1914-1944) (I) 1971
102 Probleemblad 1979

SOLUTION

  • SOUND
  • Sets
    • 1...Qh3
      • 2.Qxh3#
    • 1...Qc4
      • 2.Qh3#
    • 1...Qb5
      • 2.Qh3#
    • 1...Qe1
      • 2.Qh3#
    • 1...h4
      • 2.Qg4#
  • Tries
    • 1.Re4+?
      • 1...Rxe4
        • 2.Qf7#
      • 1...Se5
        • 2.Rxe5#
        • 2.Qf7#
      • 1...Kd5!
    • 1.Qe4+?
      • 1...Se5
        • 2.Qf5#
        • 2.Qxe5#
      • 1...Rxe4!
    • 1.Qe3+?
      • 1...Se5
        • 2.Qxe5#
      • 1...Re4!
    • 1.dxe7+?
      • 1...Sxa6
        • 2.Qc6#
      • 1...Qxa6!
  • Keys
    • 1.Rc4!
      • threat
        • 2.Qf7#
      • 1...Sxa6
        • 2.Qd5#
      • 1...Sf4
        • 2.Qe4#
      • 1...Bf6
        • 2.dxc7#
      • 1...Se5
        • 2.Sxc5#
      • 1...Sh8
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 5
  • Sets
    • Q(b);N_GUARD::QAB(B),XQ(b)
    • Q(b);N_GUARD::QAB(B)
    • P(h);N_GUARD::QAB(B)
  • Tries
    • Try
      • R(C);CHECK
      • Vars
        • R(e);XR(C)::QAB1(B)
      • Refutation
        • K(i);S_FLIGHT
    • Try
      • Q(B);CHECK
      • Refutation
        • R(e);XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • S(j);N_GUARD,P_SPINS(j)::QAR1(B),XS(j)
      • Refutation
        • R(e);P_SPINR(e)
    • Try
      • P(E);CHECK,XB(l)
      • Vars
        • S(k);XR(D)::QAR2(B)
      • Refutation
        • Q(b);XR(D)
  • Actual
    • R(C);
    • Threat
      • QAB1(B)
    • Vars
      • S(k);N_GUARD,XR(D)::QAB1(B)
      • S(j);N_GUARD::QAR2(B)
      • B(l);N_GUARD::R(D)+P(E),XS(k)
      • S(j);SBLOCK::S(F),XP(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).