MESON Chess Problem Database

Problem Display
PID: 235164 (3Q4/8/nR1pN1np/B1p1k3/KNp1p3/p3p1bB/5r2/5R2 w - - 0 1)

Erokhin, Vladimir Alekseevich

Schach, 1976

3Q4/8/nR1pN1np/B1p1k3/KNp1p3/p3p1bB/5r2/5R2

#2

8 + 12

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ra2
      • 2.Qf6#
      • 2.Qxd6#
    • 1...Rb2
      • 2.Qf6#
      • 2.Qxd6#
    • 1...Rc2
      • 2.Qf6#
      • 2.Qxd6#
    • 1...Rd2
      • 2.Qf6#
    • 1...Re2
      • 2.Qf6#
      • 2.Qxd6#
    • 1...Rg2
      • 2.Qf6#
      • 2.Qxd6#
    • 1...Rh2
      • 2.Qf6#
      • 2.Qxd6#
    • 1...Rf6
      • 2.Qxf6#
      • 2.Qxd6#
    • 1...Rf7
      • 2.Qxd6#
    • 1...Rf8
      • 2.Qxd6#
    • 1...Sf4
      • 2.Qh8#
    • 1...d5
      • 2.Sc6#
  • Tries
    • 1.Qg5+?
      • 1...Rf5
        • 2.Qxf5#
      • 1...hxg5!
    • 1.Qh8+?
      • 1...Rf6
        • 2.Qxf6#
      • 1...Sxh8!
  • Keys
    • 1.Sf4!
      • threat
        • 2.Qxd6#
      • 1...Kd4
        • 2.Sc6#
      • 1...Kxf4
        • 2.Qf6#
      • 1...Rd2
        • 2.Sc6#
      • 1...d5
        • 2.Qf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • R(a);N_GUARD::QAB1(H)
    • R(a);::QAB1(H),XP(j)
    • S(k);N_GUARD,S_CUTR(a)::QAB(H)
    • P(j);::S(D)
  • Tries
    • Try
      • Q(H);CHECK
      • Vars
        • R(a);N_GUARD,P_SPINR(a)::QAR1(H),XR(a)
      • Refutation
        • P(l);XQ(H)
    • Try
      • Q(H);CHECK
      • Vars
        • R(a);N_GUARD,P_SPINR(a)::QAB1(H),XR(a)
      • Refutation
        • S(k);XQ(H)
  • Actual
    • S(G);
    • Threat
      • QAB1(H),XP(j)
    • Vars
      • K(h);P_SPINP(j),S_FLIGHT::S(D)
      • K(h);P_SPINR(a),S_FLIGHT,XS(G)::QAR2(H)
      • R(a);::S(D)
      • P(j);::QAB1(H)
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