MESON Chess Problem Database

Problem Display
PID: 6295 (7Q/8/8/K7/8/7B/6RB/6rk w - - 0 1)

Restad, Birger

Morgenbladet, 1928

7Q/8/8/K7/8/7B/6RB/6rk

#2

5 + 2

4884 154 norske miniatyrproblemer 1974
4883 Still More Fun with Chess Miniatures 2002
5454 Near Snap 2007
136 Problem Observer 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1+
      • 2.Qxa1#
  • Tries
    • 1.Qa1?
      • threat
        • 2.Qxg1#
      • 1...Rb1
        • 2.Qxb1#
      • 1...Rc1
        • 2.Qxc1#
      • 1...Rd1
        • 2.Qxd1#
      • 1...Re1
        • 2.Qxe1#
      • 1...Rf1
        • 2.Qxf1#
      • 1...Rxa1+!
  • Keys
    • 1.Qa8!
      • 1...Ra1+
        • 2.Ra2#
      • 1...Rxg2
        • 2.Qxg2#
      • 1...Rb1
        • 2.Rb2#
      • 1...Rc1
        • 2.Rc2#
      • 1...Rd1
        • 2.Rd2#
      • 1...Re1
        • 2.Re2#
      • 1...Rf1
        • 2.Rf2#

This anticipates 52578(0000), 24909(1928), 205822(1932), 263960(1939), 16408(1940), 51226(1955), 77962(1955), 58714(1960), 210889(1985), 240458(1992)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • R(a);CHECK,OGATEB::QAB1(E),XR(a)
  • Tries
    • Try
      • Q(E);P_PINR(a)
      • Threat
        • QAR1(E),XR(a)
      • Vars
        • R(a);OGATEB::QAR(E),XR(a)
        • R(a);OGATEB::QAR2(E),XR(a)
      • Refutation
        • R(a);CHECK,N_SPINR(a),XQ(E)
  • Actual
    • Q(E);
    • Vars
      • R(a);CHECK,N_GUARD::QAB(E)+R(A)
      • R(a);OGATE,P_SPINR(a),XR(A)::QAB1(E),XR(a)
      • R(a);N_GUARD::QAB(E)+R(A)
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