MESON Chess Problem Database

Problem Display
PID: 60756 (R1N1kn2/1N5P/K4bq1/5Q1B/3p2rp/B7/8/8 w - - 0 1)

Guidelli, Giorgio

3rd HM., Good Companions (February), 1916

R1N1kn2/1N5P/K4bq1/5Q1B/3p2rp/B7/8/8

#2

8 + 7

3132 The Good Companion Two-Mover 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Qf7
      • 2.Se7#
    • 1...Be7+
      • 2.Scd6#
    • 1...Bg7+
      • 2.Sb6#
    • 1...Bd8+
      • 2.Sbd6#
    • 1...Bh8+
      • 2.Sb6#
  • Tries
    • 1.Sb6+?
      • 1...Bd8
        • 2.Rxd8#
        • 2.Qxf8#
      • 1...Kf7!
    • 1.Bxf8?
      • threat
        • 2.Scd6#
      • 1...Kf7
        • 2.Scd6#
      • 1...Kxf8!
    • 1.Qe6+?
      • 1...Be7
        • 2.Sb6#
        • 2.Scd6#
        • 2.Sa7#
        • 2.Sxe7#
      • 1...Sxe6!
    • 1.Qxf6?
      • threat
        • 2.Sb6#
      • 1...Se6
        • 2.Qe7#
        • 2.Qxe6#
      • 1...Sd7
        • 2.Sbd6#
        • 2.Scd6#
        • 2.Qe6#
      • 1...Kd7!
    • 1.h8R?
      • threat
        • 2.Rxf8#
      • 1...Be5+
        • 2.Qe6#
      • 1...Bg5+
        • 2.Bxg6#
      • 1...Be7+
        • 2.Scd6#
      • 1...Bg7+
        • 2.Sb6#
        • 2.Qe6#
      • 1...Bd8+
        • 2.Sbd6#
      • 1...Bxh8+
        • 2.Sb6#
      • 1...Kf7!
  • Keys
    • 1.h8Q!
      • threat
        • 2.Qxf8#
      • 1...Be5+
        • 2.Qe6#
      • 1...Bg5+
        • 2.Bxg6#
      • 1...Be7+
        • 2.Scd6#
      • 1...Bg7+
        • 2.Sb6#
        • 2.Qe6#
      • 1...Bd8+
        • 2.Sbd6#
      • 1...Bxh8+
        • 2.Sb6#
      • 1...Kf7
        • 2.Sbd6#
        • 2.Qxf8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • Q(e);::R(G)+S(H)
    • B(d);CHECK,SBLOCK::R(G)+S(H),DCHECK
    • B(d);CHECK,N_GUARD::R(G)+S(H)
    • B(d);CHECK,SBLOCK::S(E)
  • Tries
    • Try
      • S(H);CHECK
      • Refutation
        • K(f);P_SPINB(d),S_FLIGHT
    • Try
      • B(A);XS(g)
      • Threat
        • R(G)+S(H),DCHECK
      • Vars
        • K(f);P_SPINB(d),S_FLIGHT::S(H)
      • Refutation
        • K(f);N_SPINQ(e),P-FLIGHT,P_SPINB(d),XB(A)
    • Try
      • Q(B);CHECK
      • Refutation
        • S(g);XQ(B)
    • Try
      • Q(B);P_SPINQ(B),XB(d)
      • Threat
        • R(G)+S(H)
      • Refutation
        • K(f);N_SPINQ(e),S_FLIGHT
    • Try
      • P(F);P_PINS(g)
      • Threat
        • R1(F),XS(g)
      • Vars
        • B(d);CHECK,N_GUARD::QAR2(B)
        • B(d);CHECK,S_CUTR(b)::B(C),XQ(e)
        • B(d);CHECK,SBLOCK::R(G)+S(H),DCHECK
        • B(d);CHECK,SBLOCK::S(E)
        • B(d);CHECK,N_GUARD,N_SPINS(g),XR(F)::R(G)+S(H)
      • Refutation
        • K(f);N_SPINS(g),P_SPINB(d),S_FLIGHT
  • Actual
    • P(F);P_PINS(g)
    • Threat
      • QAR1(F),XS(g)
    • Vars
      • B(d);CHECK,N_GUARD::QAR2(B)
      • B(d);CHECK,S_CUTR(b)::B(C),XQ(e)
      • B(d);CHECK,SBLOCK::R(G)+S(H),DCHECK
      • B(d);CHECK,SBLOCK::S(E)
      • B(d);CHECK,N_GUARD,N_SPINS(g),XQ(F)::R(G)+S(H)
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