MESON Chess Problem Database

Problem Display
PID: 251797 (3nr1R1/BP4qp/PK2pp2/PpN4b/8/3N3Q/p7/Rr4k1 w - - 0 1)

Degener, Udo

Die Schwalbe, 2021

3nr1R1/BP4qp/PK2pp2/PpN4b/8/3N3Q/p7/Rr4k1

#2

10 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qg2
      • 2.Qxg2#
    • 1...Qg3
      • 2.Rxg3#
    • 1...Re1
      • 2.Rxe1#
    • 1...Rf1
      • 2.Rxf1#
  • Tries
    • 1.Sb3?
      • threat
        • 2.Kxb5#
      • 1...Qg2
        • 2.Qxg2#
      • 1...Qg5
        • 2.Kc7#
      • 1...Sc6
        • 2.Kxc6#
      • 1...b4
        • 2.Kb5#
      • 1...Sxb7!
    • 1.Rxg7+?
      • 1...Bg4
        • 2.Rxg4#
      • 1...Bg6!
    • 1.Qh2+?
      • 1...Kf1
        • 2.Qf2#
      • 1...Kxh2!
    • 1.Qg3+?
      • 1...Kf1
        • 2.Qf2#
      • 1...Kh1
        • 2.Sf2#
      • 1...Qxg3!
    • 1.b8Q?
      • threat
        • 2.Qbh2#
      • 1...Qg2
        • 2.Qxg2#
      • 1...Qg3
        • 2.Rxg3#
        • 2.Qbxg3#
      • 1...e5!
  • Keys
    • 1.Sd7!
      • threat
        • 2.Kc7#
      • 1...Sxb7
        • 2.Kxb7#
      • 1...Qg2
        • 2.Qxg2#
      • 1...Qg3
        • 2.Rxg3#
      • 1...Rc1
        • 2.Kxb5#
      • 1...Sc6
        • 2.Kxc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • Q(h);N_GUARD::QAR1(C),XQ(h)
    • Q(h);OGATE::R(J),XQ(h)
    • R(a);OGATE::R(A),XR(a)
    • R(a);OGATE::R1(A),XR(a)
  • Tries
    • Try
      • S(E);
      • Threat
        • B(H)+K(G),XP(d)
      • Vars
        • Q(h);N_GUARD::QAR1(C),XQ(h)
        • Q(h);::B(H)+K(G)
        • S(j);::B(H)+K(G),XS(j)
        • P(d);::B(H)+K(G)
      • Refutation
        • S(j);XP(I)
    • Try
      • R(J);CHECK,XQ(h)
      • Vars
        • B(e);N_GUARD,P_SPINB(e)::R(J),XB(e)
      • Refutation
        • B(e);P_SPINB(e)
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);N_GUARD,N_SPINQ(h),P-FLIGHT::QAR1(C)
      • Refutation
        • K(b);N_SPINQ(h),N_SPINR(a),S_FLIGHT,XQ(C)
    • Try
      • Q(C);CHECK,N_PINQ(h)
      • Vars
        • K(b);N_GUARD,P-FLIGHT::QAR1(C)
        • K(b);N_GUARD,P-FLIGHT,S_CUTQ(h)::S(B)
      • Refutation
        • Q(h);P_SPINQ(h),XQ(C)
    • Try
      • P(I);
      • Threat
        • QAB1(I)
      • Vars
        • Q(h);N_GUARD::QAR1(C),XQ(h)
      • Refutation
        • P(f);
  • Actual
    • S(E);
    • Threat
      • B(H)+K(G)
    • Vars
      • S(j);XP(I)::B(H)+K(G),XS(j)
      • Q(h);N_GUARD::QAR1(C),XQ(h)
      • Q(h);OGATE::R(J),XQ(h)
      • R(a);::B(H)+K(G),XP(d)
      • S(j);::B(H)+K(G),XS(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).