MESON Chess Problem Database

Problem Display
PID: 220508 (r2R1q2/2P4B/3N4/p1K1PPB1/4N3/2pkPQP1/2p2pp1/2R1bbr1 w - - 0 1)

Nietvelt, Gustaaf Josephus

Die Schwalbe, 1928

r2R1q2/2P4B/3N4/p1K1PPB1/4N3/2pkPQP1/2p2pp1/2R1bbr1

#2

13 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd6+
      • 2.Rxd6#
    • 1...Bd2
      • 2.Sxf2#
  • Tries
    • 1.Sxf2+?
      • 1...Kd2
        • 2.e4#
      • 1...Bxf2!
    • 1.Sf6?
      • threat
        • 2.e4#
      • 1...Qxd6+
        • 2.Rxd6#
      • 1...Kd2
        • 2.e4#
      • 1...Be2
        • 2.Qd5#
      • 1...Bd2!
  • Keys
    • 1.Sd2!
      • threat
        • 2.e4#
      • 1...Qxd6+
        • 2.Rxd6#
      • 1...Kxd2
        • 2.e4#
      • 1...Qxf5
        • 2.Sc8#
      • 1...Bxd2
        • 2.f6#
      • 1...Be2
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • Q(k);CHECK,OGATE,P_SPINQ(k),XS(J)::R(M),XQ(k)
    • B(a);N_GUARD,SBLOCK::S(E),XP(e)
  • Tries
    • Try
      • S(E);CHECK,XP(e)
      • Vars
        • K(h);P-FLIGHT::B(I)+P(B)
      • Refutation
        • B(a);P_PINP(B),XS(E)
    • Try
      • S(E);
      • Threat
        • QAR(C)+P(B)
      • Vars
        • Q(k);CHECK,OGATE,P_SPINQ(k),XS(J)::R(M),XQ(k)
        • K(h);P-FLIGHT::B(I)+P(B)
        • B(b);SBLOCK::QAR2(C)
      • Refutation
        • B(a);
  • Actual
    • S(E);
    • Threat
      • QAR(C)+P(B)
    • Vars
      • Q(k);CHECK,OGATE,P_SPINQ(k),XS(J)::R(M),XQ(k)
      • K(h);P-FLIGHT,XS(E)::B(I)+P(B)
      • Q(k);N_PINS(J),P_PINP(G),P_SPINQ(k),XP(H)::R(M)+S(J)
      • B(a);SBLOCK,XS(E)::B(L)+P(H)
      • B(b);SBLOCK::QAR2(C)
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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).