MESON Chess Problem Database

Problem Display
PID: 49667 (B4n1r/4Q1Rb/1P5r/K6p/6n1/4BR1P/6kb/5N1q w - - 0 1)

Alvey, George Clarence Vincent

2nd Prize, SCPF Fraternity Saturday, 1919/IV

B4n1r/4Q1Rb/1P5r/K6p/6n1/4BR1P/6kb/5N1q

#2

9 + 9

56 The Problemist 2003
5293 A selection of chess problems by G. C. Alvey 2004
15148 Sadier Collection 2014

SOLUTION

  • SOUND
  • Tries
    • 1.Rf2+?
      • 1...Kg1
        • 2.Rf4#
        • 2.Rf5#
        • 2.Rf6#
        • 2.Rff7#
        • 2.Rxf8#
      • 1...Kxh3!
    • 1.Rxg4+?
      • 1...Bg3
        • 2.Rgxg3#
      • 1...hxg4!
  • Keys
    • 1.Qh4!
      • threat
        • 2.Qf2#
      • 1...Qxf1
        • 2.Rg3#
      • 1...Qg1
        • 2.Rf2#
      • 1...Rg6
        • 2.Rf6#
      • 1...Bg1
        • 2.Rf2#
        • 2.Qg3#
      • 1...Bg3
        • 2.Qxg3#
      • 1...Bg6
        • 2.Rf5#
      • 1...Sg6
        • 2.Rf8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(C);CHECK
      • Refutation
        • K(b);N_SPINS(d),S_FLIGHT,XP(D)
    • Try
      • R(H);CHECK,XS(d)
      • Vars
        • B(c);N_GUARD,P_SPINB(c)::R1(H),XB(c)
      • Refutation
        • P(e);XR(H)
  • Actual
    • Q(G);
    • Threat
      • QAR1(G)
    • Vars
      • Q(a);SBLOCK,XS(A)::B(I)+R(C),DCHECK
      • Q(a);SBLOCK::B(I)+R(C),DCHECK
      • R(f);N_SPINS(d),S_CUTB(g)::B(I)+R(C)
      • B(c);N_GUARD,N_SPINS(d)::QAR1(G),XB(c)
      • B(g);N_SPINS(d),S_CUTR(f)::B(I)+R(C)
      • S(h);N_SPINS(d),S_CUTB(g),S_CUTR(f)::B(I)+R(C)
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