MESON Chess Problem Database

Problem Display
PID: 87646 (2r5/3B4/8/4Q3/8/2pk4/8/R3K3 w Q - 0 1)

McDowell, Michael

The Problemist, 1993

2r5/3B4/8/4Q3/8/2pk4/8/R3K3

#2

4 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rc4
      • 2.0-0-0#
  • Tries
    • 1.Bb5+?
      • 1...Rc4
        • 2.0-0-0#
      • 1...Kc2!
    • 1.Be6?
      • threat
        • 2.0-0-0#
      • 1...Kc2
        • 2.Qe2#
      • 1...c2!
    • 1.Rd1+?
      • 1...Kc4
        • 2.Qb5#
      • 1...Kc2!
  • Keys
    • 1.0-0-0+!
      • 1...Kc4
        • 2.Qb5#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • R(c);SBLOCK::0-0-0
  • Tries
    • Try
      • B(D);CHECK
      • Vars
        • R(c);P_SPINR(c)::0-0-0
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • B(D);
      • Threat
        • 0-0-0
      • Vars
        • K(b);S_FLIGHT::QAR2(C)
      • Refutation
        • P(a);
    • Try
      • R(A);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB1(C)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • K(B);0-0-0,CHECK
    • Vars
      • K(b);S_FLIGHT::QAB1(C)
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