MESON Chess Problem Database

Problem Display
PID: 173128 (2b5/8/8/8/8/7p/3R4/1kN1K2R w K - 0 1)

Shanahan, Ian

Problem Observer, 1995

2b5/8/8/8/8/7p/3R4/1kN1K2R

#2

4 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Kxc1
      • 2.Ke2#
  • Tries
    • 1.Kf2?
      • threat
        • 2.Sa2#
        • 2.Se2#
        • 2.Sb3#
        • 2.Sd3#
      • 1...Ka1
        • 2.Sa2#
        • 2.Se2#
        • 2.Sb3#
        • 2.Sd3#
      • 1...Bg4
        • 2.Se2#
      • 1...Ba6
        • 2.Se2#
        • 2.Sd3#
      • 1...Bb7!
    • 1.Sd3?
      • threat
        • 2.Ke2#
        • 2.Kf2#
        • 2.0-0#
      • 1...Ka1
        • 2.Ke2#
        • 2.Kf2#
        • 2.0-0#
      • 1...Bb7
        • 2.0-0#
      • 1...h2
        • 2.Ke2#
        • 2.Kf2#
      • 1...Bg4!
    • 1.0-0?
      • threat
        • 2.Sa2#
        • 2.Se2#
        • 2.Sb3#
        • 2.Sd3#
      • 1...Ka1
        • 2.Sa2#
        • 2.Se2#
        • 2.Sb3#
        • 2.Sd3#
      • 1...Bg4
        • 2.Se2#
      • 1...Ba6
        • 2.Se2#
        • 2.Sd3#
      • 1...h2+!
  • Keys
    • 1.Se2!
      • threat
        • 2.Kf2#
        • 2.0-0#
      • 1...Ka1
        • 2.Kf2#
        • 2.0-0#
      • 1...Bb7
        • 2.0-0#
      • 1...h2
        • 2.Kf2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • K(a);P-FLIGHT,XS(A)::R(C)+K(B)
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Threat
        • DUALS(4)
      • Vars
        • B(c);::R(C)+S(A)
      • Refutation
        • B(c);
    • Try
      • S(A);
      • Threat
        • DUALS(3)
      • Vars
        • B(c);::0-0
      • Refutation
        • B(c);
    • Try
      • K(B);0-0
      • Threat
        • DUALS(4)
      • Vars
        • B(c);::R(C)+S(A)
      • Refutation
        • P(b);CHECK
  • Actual
    • S(A);
    • Threat
      • DUALS(2)
    • Vars
      • B(c);::0-0
      • P(b);::R(C)+K(B)
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