MESON Chess Problem Database

Problem Display
PID: 245267 (7R/5Q2/1p2pPp1/5k2/R1p5/2Kp1pBN/5N2/1B6 w - - 0 1)

Erokhin, Vladimir Alekseevich

64 Shakhmatnoe obozrenie, 1978

7R/5Q2/1p2pPp1/5k2/R1p5/2Kp1pBN/5N2/1B6

#2

9 + 7

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Sf4?
      • 1...Ke5
        • 2.Qxe6#
      • 1...Kg5
        • 2.Qxg6#
      • 1...e5
        • 2.Qxg6#
      • 1...g5
        • 2.Qxe6#
      • 1...b5!
    • 1.Rh5+?
      • 1...g5
        • 2.Rxg5#
      • 1...gxh5!
    • 1.Rh6?
      • threat
        • 2.Qxg6#
      • 1...g5
        • 2.Qg6#
        • 2.Qh7#
      • 1...e5!
    • 1.Re8?
      • threat
        • 2.Qxe6#
      • 1...e5
        • 2.Rxe5#
        • 2.Qe6#
      • 1...g5!
    • 1.Rf8?
      • 1...e5
        • 2.Qd7#
      • 1...g5
        • 2.Qh7#
      • 1...b5!
    • 1.Rg8?
      • threat
        • 2.Qxg6#
      • 1...g5
        • 2.Rxg5#
        • 2.Qg6#
      • 1...e5!
    • 1.Qc7?
      • threat
        • 2.Qf4#
        • 2.Qe5#
      • 1...Kxf6
        • 2.Rf8#
      • 1...e5
        • 2.Qxe5#
      • 1...g5!
  • Keys
    • 1.Sxd3!
      • threat
        • 2.Sdf2#
        • 2.Se5#
      • 1...Ke4
        • 2.Qxe6#
      • 1...Kg4
        • 2.Qxg6#
      • 1...cxd3
        • 2.Bxd3#
      • 1...f2
        • 2.Sdxf2#
        • 2.Se5#
      • 1...e5
        • 2.Sxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(E);
      • Vars
        • K(d);N_SPINP(a),P-FLIGHT::QAR1(H),XP(f)
        • K(d);N_SPINP(a),P-FLIGHT::QAR1(H),XP(g)
        • P(f);SBLOCK::QAB1(H),XP(g)
        • P(g);SBLOCK::QAB1(H),XP(f)
      • Refutation
        • P(e);
    • Try
      • R(I);CHECK
      • Vars
        • P(g);::R1(I),XP(g)
      • Refutation
        • P(g);XR(I)
    • Try
      • R(I);
      • Threat
        • QAB1(H),XP(g)
      • Refutation
        • P(f);
    • Try
      • R(I);
      • Threat
        • QAB1(H),XP(f)
      • Refutation
        • P(g);
    • Try
      • R(I);
      • Vars
        • P(f);OGATEB::QAB(H)
        • P(g);OGATEB::QAB(H)
      • Refutation
        • P(e);
    • Try
      • R(I);
      • Threat
        • QAB1(H),XP(g)
      • Refutation
        • P(f);
    • Try
      • Q(H);
      • Threat
        • DUALS(2)
      • Vars
        • K(d);N_SPINP(a),OGATEB,P-FLIGHT,XP(G)::R(I)
        • P(f);::QAR1(H),XP(f)
      • Refutation
        • P(g);
  • Actual
    • S(B);XP(a)
    • Threat
      • DUALS(2)
    • Vars
      • K(d);P_SPINP(c),S_FLIGHT::QAR2(H),XP(f)
      • K(d);P_SPINP(c),S_FLIGHT::QAR2(H),XP(g)
      • P(c);OGATE,P_SPINP(c),XS(B)::B(A),XP(c)
      • P(f);::B(A)+S(B),XP(f)
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