MESON Chess Problem Database

Problem Display
PID: 222504 (7k/7p/7P/4R3/2B1q3/1p1bB3/1P6/K7 w - - 0 1)

Anonymous

Philadelphia Times, 1884

(First published on Sun Jul 6 1884)

7k/7p/7P/4R3/2B1q3/1p1bB3/1P6/K7

#2

6 + 5

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qb7
      • 2.Re8#
    • 1...Qd4
      • 2.Re8#
    • 1...Qh4
      • 2.Re8#
  • Tries
    • 1.Rxe4?
      • threat
        • 2.Bd4#
        • 2.Re8#
      • 1...Bxe4
        • 2.Bd4#
      • 1...Bxc4!
  • Keys
    • 1.Bd4!
      • threat
        • 2.Rxe4#
        • 2.Re8#
      • 1...Qh1+
        • 2.Re1#
      • 1...Qa8+
        • 2.Ra5#
      • 1...Qe1+
        • 2.Rxe1#
      • 1...Qxd4
        • 2.Re8#
      • 1...Qxe5
        • 2.Bxe5#
      • 1...Bxc4
        • 2.Re8#
      • 1...Qd5
        • 2.Re8#
      • 1...Qg2
        • 2.Rg5#
        • 2.Re8#
      • 1...Qf3
        • 2.Rf5#
        • 2.Re8#
      • 1...Qf5
        • 2.Rxf5#
        • 2.Re8#
      • 1...Qc6
        • 2.Re8#
      • 1...Qg6
        • 2.Re8#
      • 1...Qb7
        • 2.Re7#
        • 2.Re8#
      • 1...Qe2
        • 2.Rxe2#
        • 2.Re3#
        • 2.Re4#
        • 2.Re8#
      • 1...Qe3
        • 2.Rxe3#
        • 2.Re8#
      • 1...Qf4
        • 2.Re8#
      • 1...Qg4
        • 2.Re8#
      • 1...Qh4
        • 2.Re8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 10
    • REMOVED MATES = 1
  • Sets
    • Q(c);N_GUARD::R(E)
    • Q(c);N_GUARD,P_PINP(B)::R(E)
  • Tries
    • Try
      • R(E);XQ(c)
      • Threat
        • DUALS(2)
      • Vars
        • B(b);XR(E)::B(C)
      • Refutation
        • B(b);XB(D)
  • Actual
    • B(C);
    • Threat
      • DUALS(2)
    • Vars
      • Q(c);CHECK,OGATE::B(C)+R(E)
      • Q(c);CHECK,N_GUARD::B(C)+R(E)
      • Q(c);CHECK,OGATE::B(C)+R(E),XQ(c)
      • Q(c);P_PINP(B),XB(C)::R(E)
      • Q(c);OGATE,P_SPINQ(c),XR(E)::B(C),XQ(c)
      • B(b);XB(D)::B(C)+R(E),DCHECK
      • Q(c);::B(C)+R(E),DCHECK
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