MESON Chess Problem Database

Problem Display
PID: 87771 (8/8/6B1/4Q3/8/5k2/5n2/4K2R w K - 0 1)

Sanders, Ivor

The Problemist, 1993

8/8/6B1/4Q3/8/5k2/5n2/4K2R

#2

4 + 2

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kg4
      • 2.Bh5#
  • Tries
    • 1.Kf1?
      • 1...Kg4
        • 2.Bh5#
      • 1...Sxh1
        • 2.Bh5#
      • 1...Sd1
        • 2.Bh5#
      • 1...Sd3
        • 2.Bh5#
      • 1...Sh3
        • 2.Bh5#
      • 1...Sg4
        • 2.Rh3#
      • 1...Se4!
    • 1.Rg1?
      • threat
        • 2.Rg3#
        • 2.Qg3#
      • 1...Se4
        • 2.Qxe4#
      • 1...Sh1
        • 2.Bh5#
        • 2.Qe4#
      • 1...Sd3+!
    • 1.Rh3+?
      • 1...Kg2
        • 2.Qh2#
        • 2.Qg3#
      • 1...Kg4
        • 2.Qg3#
        • 2.Qf5#
      • 1...Sxh3!
  • Keys
    • 1.Bh5+!
      • 1...Kg2
        • 2.Qh2#
      • 1...Sg4
        • 2.0-0#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • K(b);S_FLIGHT::B(D)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Vars
        • K(b);S_FLIGHT::B(D)
        • S(a);N_GUARD,XR(B)::B(D)
        • S(a);N_GUARD::B(D)
        • S(a);N_GUARD,SBLOCK::R(B)
      • Refutation
        • S(a);
    • Try
      • R(B);
      • Threat
        • DUALS(2)
      • Vars
        • S(a);N_GUARD::QAB1(C),XS(a)
      • Refutation
        • S(a);CHECK
    • Try
      • R(B);CHECK
      • Refutation
        • S(a);XR(B)
  • Actual
    • B(D);CHECK
    • Vars
      • K(b);S_FLIGHT::QAR1(C)
      • S(a);P_SPINS(a)::0-0
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