MESON Chess Problem Database

Problem Display
PID: 2306 (1K6/8/8/2N5/1brN4/pB3Q2/1Rqp4/2k5 w - - 0 1)

Elson, Jacob

Source?, 0000

1K6/8/8/2N5/1brN4/pB3Q2/1Rqp4/2k5

#2

6 + 6

1679 American Chess Nuts 1868

SOLUTION

  • SOUND
  • Sets
    • 1...Qd1
      • 2.Sd3#
    • 1...Qd3
      • 2.Sxd3#
    • 1...Qxb2
      • 2.Qd1#
  • Tries
    • 1.Se2+?
      • 1...Kd1
        • 2.Rb1#
        • 2.Qf1#
      • 1...Kxb2!
    • 1.Rxc2+?
      • 1...Kb1
        • 2.Qd1#
      • 1...Rxc2!
  • Keys
    • 1.Qd1+!
      • 1...Kxd1
        • 2.Rb1#
      • 1...Kxb2
        • 2.Sa4#
      • 1...Qxd1
        • 2.Sd3#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • Q(b);N_GUARD::S(E)
    • Q(b);N_GUARD::S(E),XQ(b)
    • Q(b);N_GUARD,SBLOCK,XR(A)::QAR1(C)
  • Tries
    • Try
      • S(D);CHECK
      • Refutation
        • K(a);S_FLIGHT,XR(A)
    • Try
      • R(A);CHECK,XQ(b)
      • Vars
        • K(a);P-FLIGHT::QAR2(C)
      • Refutation
        • R(f);XR(A)
  • Actual
    • Q(C);CHECK
    • Vars
      • K(a);P-FLIGHT,P_SPINQ(b),XQ(C)::R(A)
      • K(a);S_FLIGHT,XR(A)::S(E)
      • Q(b);XQ(C)::S(E)
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