MESON Chess Problem Database

Problem Display
PID: 241124 (Q7/8/5Pp1/KRRNpp2/4k2N/p7/5B2/3r1B2 w - - 0 1)

Erokhin, Vladimir Alekseevich

Shakhmaty (Riga), 1973

Q7/8/5Pp1/KRRNpp2/4k2N/p7/5B2/3r1B2

#2

9 + 6

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Rb4#
      • 2.Rc4#
    • 1...Rb1
      • 2.Rc4#
    • 1...Re1
      • 2.Rb4#
      • 2.Rc4#
    • 1...Rxd5
      • 2.Rb4#
      • 2.Rc4#
    • 1...f4
      • 2.Sc3#
  • Tries
    • 1.Se3+?
      • 1...Kd4
        • 2.Sxd1#
        • 2.Sc2#
        • 2.Seg2#
        • 2.Sg4#
        • 2.Sexf5#
        • 2.Sf3#
        • 2.Rc4#
        • 2.Qd5#
      • 1...Rd5
        • 2.Rb4#
        • 2.Rc4#
      • 1...Kf4!
    • 1.Sb4+?
      • 1...Rd5
        • 2.Rc4#
      • 1...Kf4!
    • 1.Sf4+?
      • 1...Rd5
        • 2.Rb4#
        • 2.Rc4#
      • 1...Kxf4!
    • 1.Sb6+?
      • 1...Rd5
        • 2.Rb4#
        • 2.Rc4#
      • 1...Kf4!
    • 1.Sc7+?
      • 1...Rd5
        • 2.Rb4#
        • 2.Rc4#
      • 1...Kf4!
    • 1.Se7+?
      • 1...Rd5
        • 2.Rb4#
        • 2.Rc4#
      • 1...Kf4!
    • 1.Rc3?
      • threat
        • 2.Bg2#
      • 1...Rxf1
        • 2.Rb4#
      • 1...Rxd5
        • 2.Rc4#
      • 1...Rd3
        • 2.Bxd3#
      • 1...f4!
  • Keys
    • 1.Rb3!
      • threat
        • 2.Bg2#
      • 1...Rxf1
        • 2.Rc4#
      • 1...Rxd5
        • 2.Rb4#
      • 1...Rd3
        • 2.Bxd3#
      • 1...f4
        • 2.Sc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(a);N_GUARD::R(F)
    • P(e);SBLOCK::QAB(I)+S(G),DCHECK
  • Tries
    • Try
      • S(G);CHECK
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • S(G);CHECK
      • Vars
        • R(a);P_SPINR(a)::R(F)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • S(G);CHECK
      • Refutation
        • K(c);P-FLIGHT,XS(G)
    • Try
      • S(G);CHECK
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • S(G);CHECK
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • S(G);CHECK
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • R(F);
      • Threat
        • B(A)
      • Vars
        • R(a);N_GUARD,XB(A)::R(E)
        • R(a);N_GUARD,P_PINR(E),P_SPINR(a),XS(G)::R(F)
        • R(a);N_GUARD::B(A),XR(a)
      • Refutation
        • P(e);
  • Actual
    • R(E);
    • Threat
      • B(A)
    • Vars
      • R(a);N_GUARD,XB(A)::R(F)
      • R(a);N_GUARD,P_PINR(F),P_SPINR(a),XS(G)::R(E)
      • R(a);N_GUARD::B(A),XR(a)
      • P(e);SBLOCK::QAB(I)+S(G),DCHECK
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