MESON Chess Problem Database

Problem Display
PID: 76724 (1qNBr1B1/8/5pn1/2Q1Pk2/2R2bn1/2pb1N1K/2pPRpPP/2r5 w - - 0 1)

Maas, Johann H

Het Belgisch Schaakbord (L'Echiquier Belge), 1942

1qNBr1B1/8/5pn1/2Q1Pk2/2R2bn1/2pb1N1K/2pPRpPP/2r5

#2

12 + 12

5454 Near Snap 2008

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe5
      • 2.Sd6#
    • 1...Qd6
      • 2.Sxd6#
    • 1...Qa7
      • 2.Sd6#
    • 1...Qb1
      • 2.Sd6#
    • 1...Qb2
      • 2.Sd6#
    • 1...Qb3
      • 2.Sd6#
    • 1...Qb4
      • 2.Sd6#
    • 1...Qb5
      • 2.Sd6#
    • 1...Qb7
      • 2.Sd6#
    • 1...Qa8
      • 2.Sd6#
    • 1...S4xe5
      • 2.g4#
    • 1...fxe5
      • 2.Sd4#
  • Keys
    • 1.Qd5!
      • threat
        • 2.Qxd3#
      • 1...Qxe5
        • 2.Sd6#
      • 1...Rxe5
        • 2.Be6#
      • 1...Rxd8
        • 2.Be6#
        • 2.Qe6#
      • 1...Rxg8
        • 2.Qd7#
      • 1...Bxe2
        • 2.Qe4#
      • 1...Bxc4
        • 2.Qe4#
      • 1...S4xe5
        • 2.g4#
      • 1...S6xe5
        • 2.Bh7#
      • 1...fxe5
        • 2.Sd4#
      • 1...Qd6
        • 2.Sxd6#
      • 1...Qb7
        • 2.Sd6#
      • 1...Qa8
        • 2.Sd6#
      • 1...Be4
        • 2.Qxe4#

Anticipated by 44466(1929), 55034(1937)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 6
  • Sets
    • Q(k);N_GUARD,P_SPINQ(k),XP(I)::S(J)
    • Q(k);N_GUARD::S(J),XQ(k)
    • Q(k);N_GUARD::S(J)
    • S(g);OGATE,P_SPINS(g),XP(I)::P(C)
    • P(i);P_SPINP(i),XP(I)::S(E)
  • Actual
    • Q(H);
    • Threat
      • QAB(H),XB(e)
    • Vars
      • Q(k);N_GUARD,P_SPINQ(k),XP(I)::S(J)
      • R(l);N_GUARD,P_SPINR(l),XP(I)::B(L)
      • R(l);N_GUARD,XB(L)::QAB(H)
      • B(e);N_GUARD,XR(B)::QAB1(H)
      • B(e);N_GUARD,XR(G)::QAB1(H)
      • S(g);OGATE,P_SPINS(g),XP(I)::P(C)
      • S(j);OGATEB,P_SPINS(j),XP(I)::B(L)
      • P(i);P_SPINP(i),XP(I)::S(E)
      • Q(k);N_GUARD::S(J),XQ(k)
      • Q(k);N_GUARD::S(J)
      • B(e);N_GUARD::QAB1(H),XB(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).