MESON Chess Problem Database

Problem Display
PID: 102378 (8/1b6/5p2/1Q6/2p1kBp1/8/4N3/R3K2R w KQ - 0 1)

Boyer, Jean-Pierre

Europe Echecs, 1973

8/1b6/5p2/1Q6/2p1kBp1/8/4N3/R3K2R

#2

6 + 5

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kd3
      • 2.Qb1#
    • 1...Kf3
      • 2.Qxb7#
  • Tries
    • 1.Ra3?
      • threat
        • 2.Re3#
      • 1...Bd5
        • 2.Qb1#
      • 1...c3!
    • 1.Qxc4+?
      • 1...Kf3
        • 2.0-0#
      • 1...Kf5!
    • 1.Qb1+?
      • 1...Kf3
        • 2.Qxb7#
      • 1...Kd5!
    • 1.Qe5+?
      • 1...Kd3
        • 2.0-0-0#
      • 1...Kf3
        • 2.0-0#
      • 1...fxe5!
    • 1.Qxb7+?
      • 1...Kd3
        • 2.Qb1#
      • 1...Kf5!
  • Keys
    • 1.Qe8+!
      • 1...Kd3
        • 2.0-0-0#
      • 1...Kf3
        • 2.0-0#
      • 1...Kd5
        • 2.Ra5#
      • 1...Kf5
        • 2.Rh5#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(b);P_SPINP(a),S_FLIGHT::QAB(F)
    • K(b);S_FLIGHT::QAB(F),XB(e)
  • Tries
    • Try
      • R(A);
      • Threat
        • R1(A)
      • Vars
        • B(e);SBLOCK::QAB(F)
      • Refutation
        • P(a);
    • Try
      • Q(F);CHECK,XP(a)
      • Vars
        • K(b);S_FLIGHT::0-0
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(F);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB(F),XB(e)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(F);CHECK
      • Vars
        • K(b);S_FLIGHT::0-0-0
        • K(b);S_FLIGHT::0-0
      • Refutation
        • P(d);XQ(F)
    • Try
      • Q(F);CHECK,XB(e)
      • Vars
        • K(b);S_FLIGHT::QAB(F)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • Q(F);CHECK
    • Vars
      • K(b);S_FLIGHT::0-0-0
      • K(b);S_FLIGHT::0-0
      • K(b);S_FLIGHT::R(A)
      • K(b);S_FLIGHT::R(C)
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