MESON Chess Problem Database

Problem Display
PID: 21469 (4R3/3N4/1pK2Q1r/1p2qN2/RBbbk1P1/3p2P1/B1P1P3/2r3n1 w - - 0 1)

Harley, Brian

Good Companions (July), 1919

4R3/3N4/1pK2Q1r/1p2qN2/RBbbk1P1/3p2P1/B1P1P3/2r3n1

#2

12 + 10

3132 The Good Companion Two-Mover 1922
887 Mate in Two Moves 1931
17121 Encyclopedia of Chess Problems (Velimirovic/Valtonen) 2012
15290 Harley Scrapbook 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Rxf6+
      • 2.Sxf6#
    • 1...Bd5+
      • 2.Bxd5#
    • 1...Bf2
      • 2.Rxe5#
    • 1...Be3
      • 2.Rxe5#
    • 1...Bc5
      • 2.Rxe5#
  • Tries
    • 1.Sc5+?
      • 1...Bxc5
        • 2.Rxe5#
      • 1...bxc5!
    • 1.exd3+?
      • 1...Bxd3
        • 2.Bd5#
      • 1...Kf3!
  • Keys
    • 1.Bd2!
      • threat
        • 2.Sd6#
      • 1...Rxf6+
        • 2.Sxf6#
      • 1...Bd5+
        • 2.Bxd5#
      • 1...Be6
        • 2.Qxe5#
      • 1...Ba1
        • 2.cxd3#
      • 1...Bb2
        • 2.cxd3#
      • 1...Bf2
        • 2.Rxe5#
        • 2.cxd3#
      • 1...Bc3
        • 2.cxd3#
      • 1...Be3
        • 2.Rxe5#
        • 2.cxd3#
      • 1...Bc5
        • 2.Rxe5#
        • 2.cxd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • R(j);CHECK,XQ(J)::S(K),XR(j)
    • B(d);CHECK,OGATE,P_PINP(B)::B(A),XB(d)
    • B(e);N_GUARD::R1(L),XQ(h)
  • Tries
    • Try
      • S(K);CHECK
      • Vars
        • B(e);XS(K)::R1(L),XQ(h)
      • Refutation
        • P(i);XS(K)
    • Try
      • P(C);CHECK,XP(c)
      • Vars
        • B(d);OGATE,P_PINP(B),XP(C)::B(A)
      • Refutation
        • K(f);N_SPINQ(h),S_FLIGHT
  • Actual
    • B(F);
    • Threat
      • S(H)
    • Vars
      • R(j);CHECK,XQ(J)::S(K),XR(j)
      • B(d);CHECK,OGATE,P_PINP(B),P_SPINB(e)::B(A),XB(d)
      • B(d);N_PINQ(J),N_SPINQ(h),P_PINP(B),P_SPINB(e)::QAR1(J),XQ(h)
      • B(e);P_SPINB(d)::P(B),XP(c)
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