MESON Chess Problem Database

Problem Display
PID: 234104 (4K1n1/2b1R3/p3Pp2/1pQNkr2/rRb5/2Pp1P1B/8/8 w - - 0 1)

Erokhin, Vladimir Alekseevich

Buletin Problemistic, 1980

4K1n1/2b1R3/p3Pp2/1pQNkr2/rRb5/2Pp1P1B/8/8

#2

9 + 10

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Bxd5
      • 2.Qxc7#
    • 1...Bd6
      • 2.Qd4#
  • Tries
    • 1.Kd7?
      • threat
        • 2.Qd4#
      • 1...Bb6
        • 2.Qd6#
      • 1...Rf4!
    • 1.Se3+?
      • 1...Bd5
        • 2.Sg4#
        • 2.Qxd5#
        • 2.Qxc7#
      • 1...Kf4!
    • 1.Sf4+?
      • 1...Bd5
        • 2.Sxd3#
        • 2.Sg6#
        • 2.Qxd5#
        • 2.Qxc7#
      • 1...Kxf4!
    • 1.Sb6+?
      • 1...Bd5
        • 2.Sd7#
        • 2.Qxd5#
        • 2.Qxc7#
      • 1...Kf4!
    • 1.Sxf6+?
      • 1...Kxf6
        • 2.Qxf5#
      • 1...Bd5
        • 2.Sg4#
        • 2.Sd7#
      • 1...Kf4!
    • 1.Sxc7+?
      • 1...Bd5
        • 2.Qxd5#
      • 1...Kf4!
    • 1.f4+?
      • 1...Ke4
        • 2.Bg2#
      • 1...Rxf4!
  • Keys
    • 1.Rd7!
      • threat
        • 2.Qe3#
      • 1...Kxe6
        • 2.Sxc7#
      • 1...Rxf3
        • 2.Qd4#
      • 1...Bxd5
        • 2.Qxd5#
      • 1...Rf4
        • 2.Qxc7#
      • 1...Bb6
        • 2.Qd6#
      • 1...Bd6
        • 2.Qxd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • B(c);P_SPINB(c),SBLOCK,XS(F)::QAB(E),XB(i)
    • B(i);SBLOCK::QAB1(E)
  • Tries
    • Try
      • K(I);S_FLIGHT
      • Threat
        • QAB1(E)
      • Vars
        • B(i);N_GUARD::QAB1(E)
      • Refutation
        • R(f);
    • Try
      • S(F);CHECK
      • Refutation
        • K(e);P_SPINB(c),S_FLIGHT
    • Try
      • S(F);CHECK
      • Refutation
        • K(e);P_SPINB(c),S_FLIGHT,XS(F)
    • Try
      • S(F);CHECK
      • Refutation
        • K(e);P_SPINB(c),S_FLIGHT
    • Try
      • S(F);CHECK,XP(h)
      • Vars
        • K(e);OGATE,S_FLIGHT,XS(F)::QAR1(E),XR(f)
      • Refutation
        • K(e);P_SPINB(c),S_FLIGHT
    • Try
      • S(F);CHECK,XB(i)
      • Vars
        • B(c);N_GUARD,P_SPINB(c)::QAR1(E),XB(c)
      • Refutation
        • K(e);P_SPINB(c),S_FLIGHT
    • Try
      • P(B);CHECK
      • Vars
        • K(e);P-FLIGHT,P_SPINB(c)::B(C)
      • Refutation
        • R(f);XP(B)
  • Actual
    • R(H);
    • Threat
      • QAR2(E)
    • Vars
      • K(e);P-FLIGHT,P_SPINR(f),XP(G)::S(F),XB(i)
      • R(f);XP(B)::QAB1(E)
      • B(c);OGATE,P_SPINB(c),XS(F)::QAR1(E),XB(c)
      • R(f);::QAB(E),XB(i)
      • B(i);N_GUARD::QAB1(E)
      • B(i);N_GUARD::QAB1(E),XB(i)
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