MESON Chess Problem Database

Problem Display
PID: 206771 (8/8/pR1P4/1pk5/4K3/6b1/2PB4/5Q2 w - - 0 1)

Boileau, J

La Strategie, 1870

8/8/pR1P4/1pk5/4K3/6b1/2PB4/5Q2

#2

6 + 4

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...b4
      • 2.Be3#
    • 1...a5
      • 2.Qxb5#
  • Tries
    • 1.Qg1+?
      • 1...Kc4
        • 2.Rc6#
        • 2.Qd4#
      • 1...Bf2!
    • 1.Qf2+?
      • 1...Kc4
        • 2.Rc6#
        • 2.Qd4#
      • 1...Bxf2!
    • 1.Qf7?
      • threat
        • 2.Qc7#
      • 1...Kxb6
        • 2.Qc7#
      • 1...Bxd6!
  • Keys
    • 1.Qc4+!
      • 1...Kxc4
        • 2.Rc6#
      • 1...Kxb6
        • 2.Qc7#
      • 1...bxc4
        • 2.Be3#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • P(b);::B(C)
    • P(d);N_GUARD::QAR1(A),XP(b)
  • Tries
    • Try
      • Q(A);CHECK
      • Refutation
        • B(a);P_SPINB(a)
    • Try
      • Q(A);CHECK
      • Refutation
        • B(a);XQ(A)
    • Try
      • Q(A);
      • Threat
        • QAR2(A)
      • Vars
        • K(c);S_FLIGHT,XR(E)::QAB1(A)
      • Refutation
        • B(a);XP(F)
  • Actual
    • Q(A);CHECK
    • Vars
      • K(c);P-FLIGHT,XQ(A)::R(E)
      • K(c);OGATE,S_FLIGHT,XR(E)::QAB1(A)
      • P(b);SBLOCK,XQ(A)::B(C)
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