MESON Chess Problem Database

Problem Display
PID: 60835 (3R4/1k6/p1NP3p/2P5/8/KN3q2/6Br/1Q6 w - - 0 1)

Berd, Benjamin M

3rd HM., Good Companions (March), 1915

3R4/1k6/p1NP3p/2P5/8/KN3q2/6Br/1Q6

#2

8 + 5

3132 The Good Companion Two-Mover 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Qd1
      • 2.Sba5#
      • 2.Rb8#
      • 2.Qh7#
    • 1...Qe2
      • 2.Sba5#
      • 2.Rb8#
    • 1...Qxg2
      • 2.Sba5#
    • 1...Qe4
      • 2.Sba5#
    • 1...Qg4
      • 2.Sbd4#
      • 2.Sba5#
      • 2.Rb8#
    • 1...Qd5
      • 2.Sba5#
    • 1...Qh5
      • 2.Sa1#
      • 2.Sc1#
      • 2.Sd2#
      • 2.Sbd4#
      • 2.Sba5#
      • 2.Rb8#
    • 1...Qxc6
      • 2.Qh7#
    • 1...Qf1
      • 2.Sba5#
      • 2.Rb8#
    • 1...Qf2
      • 2.Sd2#
      • 2.Sba5#
      • 2.Rb8#
    • 1...Qxb3+
      • 2.Qxb3#
    • 1...Qc3
      • 2.Rb8#
    • 1...Qd3
      • 2.Rb8#
    • 1...Qe3
      • 2.Rb8#
    • 1...Qg3
      • 2.Rb8#
    • 1...Qh3
      • 2.Rb8#
    • 1...Qf4
      • 2.Sbd4#
      • 2.Sba5#
      • 2.Rb8#
    • 1...Qf5
      • 2.Sba5#
      • 2.Rb8#
    • 1...Qf6
      • 2.Sbd4#
      • 2.Sba5#
      • 2.Rb8#
    • 1...Qf7
      • 2.Sba5#
      • 2.Rb8#
    • 1...Qf8
      • 2.Sa1#
      • 2.Sc1#
      • 2.Sd2#
      • 2.Sbd4#
      • 2.Sba5#
  • Tries
    • 1.Rd7+?
      • 1...Ka8
        • 2.Ra7#
      • 1...Kc8
        • 2.Rc7#
      • 1...Kxc6!
    • 1.Qh7+?
      • 1...Qf7
        • 2.Sba5#
        • 2.Rb8#
        • 2.Qxf7#
      • 1...Kxc6!
  • Keys
    • 1.Qd3!
      • threat
        • 2.Sba5#
      • 1...Kxc6
        • 2.Bxf3#
      • 1...Qxc6
        • 2.Qh7#
      • 1...Qxd3
        • 2.Rb8#
      • 1...a5
        • 2.Sbxa5#
        • 2.Qb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 8
  • Sets
    • Q(b);N_PINS(D),XB(B)::QAR(A)+S(D),DCHECK
    • Q(b);N_PINS(D)::QAR(A)+S(D),DCHECK
    • Q(b);N_GUARD,N_PINS(D),P_SPINQ(b),XS(F)::QAR(A)
    • Q(b);CHECK,OGATE,P_SPINQ(b),XS(D)::QAR(A),XQ(b)
    • Q(b);::R1(H)
  • Tries
    • Try
      • R(H);CHECK
      • Vars
        • K(e);OGATE,S_FLIGHT::R1(H)
        • K(e);S_FLIGHT::R1(H)
      • Refutation
        • K(e);P_SPINQ(b),S_FLIGHT,XS(F)
    • Try
      • Q(A);CHECK
      • Refutation
        • K(e);P_SPINQ(b),S_FLIGHT,XS(F)
  • Actual
    • Q(A);N_SPINS(D)
    • Threat
      • S(D)
    • Vars
      • K(e);OGATEB,P_SPINQ(b),S_FLIGHT,XS(F)::B(B),XQ(b)
      • Q(b);N_GUARD,P_SPINQ(b),XS(F)::QAR(A)
      • Q(b);P_PINS(D),XQ(A)::R1(H)
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