MESON Chess Problem Database

Problem Display
PID: 207094 (2n1NK2/1p3R2/2k1P3/P1pn1Q2/1R3P2/4pr2/6B1/7b w - - 0 1)

Fedyakov, Sergey

Deutsche Schachblatter, 1985

2n1NK2/1p3R2/2k1P3/P1pn1Q2/1R3P2/4pr2/6B1/7b

#2

9 + 8

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rf1
      • 2.Rc7#
      • 2.Qxd5#
    • 1...Rf2
      • 2.Rc7#
      • 2.Qxd5#
    • 1...Rg3
      • 2.Rc7#
      • 2.Qxd5#
    • 1...Rh3
      • 2.Rc7#
      • 2.Qxd5#
    • 1...Rxf4
      • 2.Rc7#
      • 2.Qxd5#
    • 1...Sc3
      • 2.Rc7#
    • 1...Sxf4
      • 2.Rc7#
    • 1...Sdb6
      • 2.Rc7#
    • 1...Sf6
      • 2.Rc7#
    • 1...Sc7
      • 2.Rxc7#
  • Tries
    • 1.Bxf3?
      • threat
        • 2.Rc7#
        • 2.Qxd5#
      • 1...cxb4
        • 2.Qxd5#
      • 1...Sb6
        • 2.Rxb6#
        • 2.Rc7#
      • 1...Se7
        • 2.Rb6#
      • 1...Bxf3!
    • 1.Rd7?
      • threat
        • 2.Qxd5#
      • 1...Rxf4
        • 2.Rc7#
      • 1...Sxf4
        • 2.Rc7#
      • 1...Sc3
        • 2.Rc7#
      • 1...Sdb6
        • 2.Rc7#
      • 1...Sf6
        • 2.Rc7#
      • 1...Sc7
        • 2.Rxc7#
      • 1...Sde7
        • 2.Rc7#
      • 1...Scb6
        • 2.Rd6#
      • 1...Sd6
        • 2.Rxd6#
      • 1...Sce7
        • 2.Rd6#
      • 1...Sxb4!
  • Keys
    • 1.Qe4!
      • threat
        • 2.Rc7#
      • 1...Rxf4
        • 2.Qxd5#
      • 1...cxb4
        • 2.Qc4#
      • 1...Se7
        • 2.Rb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • S(e);N_GUARD,P_SPINR(c)::R1(G)
    • S(e);N_GUARD,P_SPINR(c),XP(C)::R1(G)
    • S(e);N_GUARD,P_SPINR(c)::R1(G),XS(e)
  • Tries
    • Try
      • B(A);P_PINS(e),XR(c)
      • Threat
        • DUALS(2)
      • Vars
        • P(d);XR(B)::QAB1(E),XS(e)
        • S(h);N_GUARD::R1(B)
      • Refutation
        • B(a);N_SPINS(e),XB(A)
    • Try
      • R(G);
      • Threat
        • QAB1(E),XS(e)
      • Vars
        • R(c);P_PINQ(E),P_SPINS(e),XP(C)::R1(G)
        • S(e);N_GUARD,P_SPINR(c),XP(C)::R1(G)
        • S(e);N_GUARD,P_SPINR(c)::R1(G)
        • S(e);N_GUARD,P_SPINR(c)::R1(G),XS(e)
        • S(h);N_GUARD::R1(G)
        • S(h);N_GUARD::R1(G),XS(h)
      • Refutation
        • S(e);P_SPINR(c),XR(B)
  • Actual
    • Q(E);P_PINS(e)
    • Threat
      • R1(G)
    • Vars
      • R(c);P_PINR(G),XP(C)::QAB1(E),XS(e)
      • P(d);OGATEB,XR(B)::QAR2(E)
      • S(h);N_GUARD::R1(B)
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