MESON Chess Problem Database

Problem Display
PID: 194916 (K1Q2bn1/p4p2/6N1/2Bk1B2/8/2p1p3/3N2b1/q2R3r w - - 0 1)

Knotek, Ladislav

Svetozor, 1918

K1Q2bn1/p4p2/6N1/2Bk1B2/8/2p1p3/3N2b1/q2R3r

#2

7 + 10

5454 Near Snap 2019
6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Bf1
      • 2.Be4#
    • 1...Bh3
      • 2.Be4#
    • 1...Be4
      • 2.Bxe4#
    • 1...f6
      • 2.Be6#
  • Tries
    • 1.Sf1+?
      • 1...Qxd1
        • 2.Sxe3#
      • 1...Kc4+!
    • 1.Sc4+?
      • 1...Qxd1
        • 2.Sxe3#
      • 1...Rxd1
        • 2.Sxe3#
      • 1...Kxc4+!
    • 1.Bxf8?
      • threat
        • 2.Qd7#
        • 2.Qc4#
        • 2.Qc5#
      • 1...Kd4+
        • 2.Sf3#
      • 1...cxd2
        • 2.Qc5#
      • 1...exd2
        • 2.Qc5#
      • 1...fxg6
        • 2.Qc5#
      • 1...Qa2
        • 2.Qd7#
        • 2.Qc5#
      • 1...Qa3
        • 2.Sf1#
        • 2.Qc4#
      • 1...Qa4
        • 2.Qc5#
      • 1...Qa5
        • 2.Sf1#
        • 2.Qd7#
        • 2.Qc4#
      • 1...Qa6
        • 2.Qc5#
      • 1...Rh4
        • 2.Qd7#
        • 2.Qc5#
      • 1...Bf1
        • 2.Qd7#
        • 2.Qc5#
      • 1...Sf6
        • 2.Qc4#
        • 2.Qc5#
      • 1...Se7!
    • 1.Qd7+?
      • 1...Bd6
        • 2.Qxd6#
      • 1...Kxc5+!
  • Keys
    • 1.Bd6!
      • threat
        • 2.Qc5#
      • 1...Kd4+
        • 2.Sf3#
      • 1...Kxd6+
        • 2.Se4#
      • 1...Bxd6
        • 2.Qc4#
      • 1...Qa3
        • 2.Sf1#
      • 1...Qa5
        • 2.Sf1#

Anticipated by 186028(1918)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 4
  • Sets
    • B(c);N_GUARD::B(D)
    • B(c);N_GUARD::B(D),XB(c)
    • P(h);N_GUARD::B(D)
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • Q(a);XR(A)::S(B),XP(e)
      • Refutation
        • K(f);CHECK,S_FLIGHT
    • Try
      • S(B);CHECK
      • Vars
        • Q(a);XR(A)::S(B),XP(e)
        • R(b);XR(A)::S(B),XP(e)
      • Refutation
        • K(f);CHECK,S_FLIGHT,XS(B)
    • Try
      • B(C);XB(i)
      • Threat
        • DUALS(3)
      • Vars
        • K(f);CHECK,P-FLIGHT::R(A)+S(B),DCHECK
        • P(d);P_SPINP(d),XS(B)::QAR1(G)
        • P(e);P_SPINP(e),XS(B)::QAR1(G)
        • P(h);XS(E)::QAR1(G)
        • Q(a);::QAR1(G)
      • Refutation
        • S(j);
    • Try
      • Q(G);CHECK
      • Vars
        • B(i);N_GUARD,P_SPINB(i)::QAR1(G),XB(i)
      • Refutation
        • K(f);CHECK,P-FLIGHT,XB(C)
  • Actual
    • B(C);
    • Threat
      • QAR1(G)
    • Vars
      • K(f);CHECK,P-FLIGHT::R(A)+S(B),DCHECK
      • K(f);CHECK,P-FLIGHT,XB(C)::R(A)+S(B),DCHECK
      • B(i);SBLOCK,XB(C)::QAB1(G)
      • Q(a);N_GUARD::R(A)+S(B)
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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).