MESON Chess Problem Database

Problem Display
PID: 208190 (8/8/6pp/2R1n3/7k/7P/4Q3/5K2 w - - 0 1)

Lyons, William Henry

Dubuque Chess Journal, 1875

8/8/6pp/2R1n3/7k/7P/4Q3/5K2

#2

4 + 4

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sd3
      • 2.Qg4#
    • 1...Sc4
      • 2.Qg4#
    • 1...Sg4
      • 2.Qxg4#
    • 1...Sc6
      • 2.Qg4#
    • 1...Sd7
      • 2.Qg4#
    • 1...Sf7
      • 2.Qg4#
  • Keys
    • 1.Rc4+!
      • 1...Kg3
        • 2.Qg2#
      • 1...Kxh3
        • 2.Qg2#
      • 1...Kg5
        • 2.Qxe5#
      • 1...Sxc4
        • 2.Qg4#
      • 1...Sg4
        • 2.Qxg4#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • S(b);N_GUARD::QAR1(B)
    • S(b);N_GUARD::QAR1(B),XS(b)
  • Actual
    • R(D);CHECK
    • Vars
      • K(a);S_FLIGHT::QAR1(B)
      • K(a);P-FLIGHT,XP(C)::QAB1(B)
      • K(a);S_FLIGHT::QAR2(B),XS(b)
      • S(b);N_GUARD,XR(D)::QAR1(B)
      • S(b);N_GUARD,P_SPINS(b)::QAR1(B),XS(b)
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