MESON Chess Problem Database

Problem Display
PID: 266681 (8/4p2q/4R2r/K1Bk1BN1/1p6/bP1N1R1p/7r/5b2 w - - 0 1)

Lincoln, Robert A

The Problemist, 1997

8/4p2q/4R2r/K1Bk1BN1/1p6/bP1N1R1p/7r/5b2

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qxf5
      • 2.Rxf5#
    • 1...Qg8
      • 2.Be4#
    • 1...Qf7
      • 2.Be4#
    • 1...Qg7
      • 2.Be4#
    • 1...Qh8
      • 2.Be4#
    • 1...Rg6
      • 2.Be4#
  • Tries
    • 1.Kb5?
      • threat
        • 2.Re5#
      • 1...Bxd3+
        • 2.Rxd3#
      • 1...Qxf5
        • 2.Rxf5#
      • 1...Rxe6
        • 2.Bxe6#
      • 1...Qg7
        • 2.Be4#
      • 1...Qh8
        • 2.Be4#
      • 1...Re2
        • 2.Sf4#
      • 1...Bb2!
  • Keys
    • 1.Kb6!
      • threat
        • 2.Sf4#
      • 1...Rxe6+
        • 2.Bxe6#
      • 1...Qxf5
        • 2.Rxf5#
      • 1...Bxd3
        • 2.Rxd3#
      • 1...Rh4
        • 2.Re5#
      • 1...Bc1
        • 2.Sxb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • Q(i);OGATE,XB(F)::R(C),XQ(i)
    • Q(i);N_GUARD::B(F)
    • R(g);S_CUTQ(i)::B(F)
  • Tries
    • Try
      • K(D);P-FLIGHT,P_SPINS(B)
      • Threat
        • R1(H)
      • Vars
        • B(a);CHECK,OGATE,XS(B)::R(C),XB(a)
        • Q(i);OGATE,XB(F)::R(C),XQ(i)
        • R(g);OGATE,XR(H)::B(F),XR(g)
        • Q(i);N_GUARD::B(F)
        • R(b);N_PINS(B)::S(B)
      • Refutation
        • B(c);
  • Actual
    • K(D);P_SPINR(H),S_FLIGHT
    • Threat
      • S(B)
    • Vars
      • R(g);CHECK,OGATE,XR(H)::B(F),XR(g)
      • Q(i);OGATE,XB(F)::R(C),XQ(i)
      • B(a);OGATE,XS(B)::R(C),XB(a)
      • R(g);N_PINR(H)::R1(H)
      • B(c);N_GUARD::S(B),XP(e)
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