MESON Chess Problem Database

Problem Display
PID: 150570 (8/8/8/7Q/8/5R1K/4R3/2k3q1 w - - 0 1)

Ahlheim, Karl-Heinz

Schach-Report, 1989

8/8/8/7Q/8/5R1K/4R3/2k3q1

#2

4 + 2

15148 Sadier Collection 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Qc5
      • 2.Rf1#
    • 1...Qb6
      • 2.Rf1#
    • 1...Qa7
      • 2.Rf1#
    • 1...Qf1+
      • 2.Rxf1#
    • 1...Qg5
      • 2.Rf1#
    • 1...Qg6
      • 2.Rf1#
    • 1...Qg7
      • 2.Rf1#
    • 1...Qg8
      • 2.Rf1#
  • Tries
    • 1.Qg5+?
      • 1...Kb1
        • 2.Qxg1#
      • 1...Kd1
        • 2.Qd2#
      • 1...Qxg5
        • 2.Rf1#
      • 1...Qe3!
  • Keys
    • 1.Qc5+!
      • 1...Kb1
        • 2.Qxg1#
      • 1...Kd1
        • 2.Qc2#
      • 1...Qxc5
        • 2.Rf1#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 7
  • Sets
    • Q(b);N_GUARD::R(B)
    • Q(b);CHECK,N_GUARD::R(B),XQ(b)
  • Tries
    • Try
      • Q(D);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR(D),XQ(b)
        • K(a);P-FLIGHT::QAR1(D)
        • Q(b);XQ(D)::R(B)
      • Refutation
        • Q(b);P_PINR(B),P_SPINQ(b)
  • Actual
    • Q(D);CHECK
    • Vars
      • K(a);P-FLIGHT::QAR(D),XQ(b)
      • K(a);P-FLIGHT::QAB1(D)
      • Q(b);XQ(D)::R(B)
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