MESON Chess Problem Database

Problem Display
PID: 11685 (8/8/2b2K2/r5p1/R2Q2Bk/4N1p1/8/8 w - - 0 1)

Frigin, Valery Fedorovich

2nd HM., Georgie-50 JT, 1971

8/8/2b2K2/r5p1/R2Q2Bk/4N1p1/8/8

#2

5 + 5

3310 2345 Chess Problems 1997

SOLUTION

  • SOUND
  • Sets
    • 1...Rxa4
      • 2.Sf5#
    • 1...Rd5
      • 2.Sg2#
    • 1...Rf5+
      • 2.Sxf5#
    • 1...Ra6
      • 2.Sf5#
    • 1...Ra7
      • 2.Sf5#
    • 1...Ra8
      • 2.Sf5#
    • 1...Bg2
      • 2.Sxg2#
    • 1...Bxa4
      • 2.Sg2#
    • 1...Bb5
      • 2.Sg2#
      • 2.Sf5#
    • 1...Bd5
      • 2.Sf5#
    • 1...Bd7
      • 2.Sg2#
    • 1...Be8
      • 2.Sg2#
  • Tries
    • 1.Rxa5?
      • threat
        • 2.Sf5#
      • 1...Bd7
        • 2.Sg2#
      • 1...Be4!
  • Keys
    • 1.Qd5!
      • threat
        • 2.Sg2#
        • 2.Sf5#
      • 1...Rxa4
        • 2.Qxg5#
      • 1...Rxd5
        • 2.Sg2#
      • 1...Bxa4
        • 2.Qh1#
      • 1...Bxd5
        • 2.Sf5#
      • 1...g2
        • 2.Sf5#
      • 1...Bd7
        • 2.Sg2#
        • 2.Qh1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 7
  • Sets
    • R(c);N_GUARD,XR(B)::S(A)
    • R(c);S_CUTB(e)::S(A)
    • R(c);CHECK,N_GUARD::S(A),XR(c)
    • R(c);N_GUARD::S(A)
    • B(e);N_GUARD::S(A),XB(e)
    • B(e);N_GUARD,XR(B)::S(A)
    • B(e);S_CUTR(c)::S(A)
    • B(e);N_GUARD::S(A)
  • Tries
    • Try
      • R(B);XR(c)
      • Threat
        • S(A)
      • Vars
        • B(e);N_GUARD::S(A)
      • Refutation
        • B(e);
  • Actual
    • Q(C);
    • Threat
      • DUALS(2)
    • Vars
      • R(c);N_GUARD,SBLOCK,XR(B)::QAB1(C),XP(d)
      • R(c);XQ(C)::S(A)
      • B(e);N_GUARD,SBLOCK,XR(B)::QAR(C)
      • B(e);XQ(C)::S(A)
      • P(a);::S(A)
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