MESON Chess Problem Database

Problem Display
PID: 21806 (4Q3/8/B2N1n2/n2pP3/1P1k4/8/p1pPp2B/r5NK w - - 0 1)

Larsen, Karl Adolf Koefoed

8. American Chess Congress, 1921

4Q3/8/B2N1n2/n2pP3/1P1k4/8/p1pPp2B/r5NK

#2

9 + 8

3132 The Good Companion Two-Mover 1922
3360 Simple Two-move Themes 1924
14868 Pirnie Collection 2012

SOLUTION

  • SOUND
  • Sets
    • 1...Rxg1+
      • 2.Bxg1#
    • 1...Se4
      • 2.Sf5#
    • 1...c1S
      • 2.Sf3#
    • 1...c1B
      • 2.Sxe2#
      • 2.Sf3#
    • 1...e1S
      • 2.Se2#
    • 1...e1B
      • 2.Se2#
      • 2.Sf3#
  • Tries
    • 1.exf6?
      • threat
        • 2.Sf5#
        • 2.Be5#
        • 2.Qe3#
        • 2.Qe5#
      • 1...Rxg1+
        • 2.Bxg1#
      • 1...e1Q
        • 2.Sf5#
      • 1...e1R
        • 2.Sf5#
      • 1...Rf1
        • 2.Be5#
        • 2.Qe3#
        • 2.Qe5#
      • 1...Sc6
        • 2.Sf5#
        • 2.Qe3#
      • 1...Sc4!
  • Keys
    • 1.Qg6!
      • threat
        • 2.Qd3#
      • 1...Rxg1+
        • 2.Qxg1#
      • 1...c1S
        • 2.Sf3#
      • 1...e1S
        • 2.Se2#
      • 1...Sc4
        • 2.Sb5#
      • 1...Se4
        • 2.Sf5#

This is after

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • R(a);CHECK,OGATE,XS(A)::B(D),XR(a)
    • S(h);SBLOCK::S(H)
    • P(c);N_PINS(A)::S(A)
    • P(d);N_PINS(A)::S(A)
  • Tries
    • Try
      • P(F);XS(h)
      • Threat
        • DUALS(4)
      • Vars
        • R(a);CHECK,OGATE,XS(A)::B(D),XR(a)
        • P(d);::S(H)
      • Refutation
        • S(f);
  • Actual
    • Q(I);
    • Threat
      • QAR1(I)
    • Vars
      • R(a);CHECK,OGATE,XS(A)::QAB(I),XR(a)
      • P(c);N_PINS(A)::S(A)
      • P(d);N_PINS(A)::S(A)
      • S(f);SBLOCK::S(H)
      • S(h);SBLOCK::S(H)
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