MESON Chess Problem Database

Problem Display
PID: 208052 (4B3/4p1P1/8/r7/2k1K3/1N1Nn3/1RP5/1Q6 w - - 0 1)

Lacy, Richard

Dubuque Chess Journal, 1873

4B3/4p1P1/8/r7/2k1K3/1N1Nn3/1RP5/1Q6

#2

8 + 4

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sxc2
      • 2.Rxc2#
      • 2.Qxc2#
  • Tries
    • 1.Qe1?
      • threat
        • 2.Sxa5#
        • 2.Qb4#
      • 1...Re5+
        • 2.Sxe5#
      • 1...Sxc2
        • 2.Sxa5#
      • 1...Ra1
        • 2.Se5#
        • 2.Qb4#
      • 1...Ra2
        • 2.Se5#
        • 2.Qb4#
      • 1...Ra3
        • 2.Se5#
        • 2.Qb4#
      • 1...Ra4
        • 2.Se5#
      • 1...Rc5
        • 2.Qb4#
      • 1...Rd5
        • 2.Qb4#
      • 1...Rf5
        • 2.Qb4#
      • 1...Rg5
        • 2.Qb4#
      • 1...Rh5
        • 2.Qb4#
      • 1...Ra6
        • 2.Se5#
        • 2.Qb4#
      • 1...Ra7
        • 2.Se5#
        • 2.Qb4#
      • 1...Ra8
        • 2.Se5#
        • 2.Qb4#
      • 1...Sd5
        • 2.Sxa5#
        • 2.Se5#
      • 1...Rb5!
  • Keys
    • 1.Sxa5+!
      • 1...Kc3
        • 2.Qe1#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • R(c);CHECK,N_GUARD::S(E),XR(c)
        • S(a);XP(C)::S(D),XR(c)
        • R(c);N_GUARD::S(E)
        • R(c);::QAR1(A)
      • Refutation
        • R(c);
  • Actual
    • S(D);CHECK,XR(c)
    • Vars
      • K(b);P-FLIGHT::QAB(A)
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