MESON Chess Problem Database

Problem Display
PID: 171269 (1K1N4/1p5B/1p3P2/1P1pk3/1Q2P3/8/8/2B5 w - - 0 1)

Antonov, Yuri Mikhailovich

Archakov, Vladimir Mikhailovich

4th Comm., Chervoni Girnik, 1975

1K1N4/1p5B/1p3P2/1P1pk3/1Q2P3/8/8/2B5

#2

8 + 4

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...d4
      • 2.Qe7#
  • Tries
    • 1.Kc7?
      • 1...dxe4
        • 2.Qd6#
      • 1...d4
        • 2.Qd6#
        • 2.Qe7#
      • 1...Kxf6!
    • 1.Sc6+?
      • 1...Ke6
        • 2.Qe7#
      • 1...Kxf6
        • 2.Qe7#
      • 1...bxc6!
    • 1.Sxb7?
      • 1...Ke6
        • 2.Qe7#
      • 1...dxe4
        • 2.Qd6#
      • 1...d4
        • 2.Qd6#
        • 2.Qe7#
      • 1...Kxf6!
    • 1.Sf7+?
      • 1...Ke6
        • 2.Qe7#
      • 1...Kxf6!
    • 1.Ba3?
      • 1...Kxf6
        • 2.Qe7#
      • 1...dxe4
        • 2.Qd6#
      • 1...d4
        • 2.Qd6#
      • 1...Kf4!
    • 1.Be3?
      • threat
        • 2.Qe7#
      • 1...dxe4
        • 2.Qd4#
      • 1...Kxf6!
    • 1.Bf4+?
      • 1...Kxf6
        • 2.Qf8#
      • 1...Kxf4!
    • 1.Bg5?
      • 1...d4
        • 2.Qe7#
      • 1...dxe4!
    • 1.Bh6?
      • 1...Kxf6
        • 2.Qd6#
      • 1...d4
        • 2.Qe7#
      • 1...dxe4!
    • 1.Qc3+?
      • 1...Kd6
        • 2.Qc7#
      • 1...d4!
    • 1.Qd4+?
      • 1...Kd6
        • 2.Qxd5#
      • 1...Kxd4!
  • Keys
    • 1.Qd2!
      • 1...Kd6
        • 2.Qxd5#
      • 1...Kxf6
        • 2.Qg5#
      • 1...dxe4
        • 2.Bb2#
      • 1...d4
        • 2.Qf4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(a);SBLOCK::QAR2(B)
  • Tries
    • Try
      • K(G);S_FLIGHT
      • Vars
        • P(a);XP(C)::QAB1(B)
      • Refutation
        • K(b);S_FLIGHT,XP(E)
    • Try
      • S(H);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(B)
        • K(b);S_FLIGHT,XP(E)::QAB1(B)
      • Refutation
        • P(d);XS(H)
    • Try
      • S(H);XP(d)
      • Vars
        • K(b);P-FLIGHT::QAR1(B)
        • P(a);XP(C)::QAB1(B)
      • Refutation
        • K(b);S_FLIGHT,XP(E)
    • Try
      • S(H);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(B)
      • Refutation
        • K(b);S_FLIGHT,XP(E)
    • Try
      • B(A);
      • Vars
        • K(b);S_FLIGHT,XP(E)::QAB1(B)
        • P(a);XP(C)::QAB1(B)
        • P(a);::QAB1(B)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • B(A);
      • Threat
        • QAR2(B)
      • Vars
        • P(a);XP(C)::QAB1(B)
      • Refutation
        • K(b);S_FLIGHT,XP(E)
    • Try
      • B(A);CHECK
      • Vars
        • K(b);S_FLIGHT,XP(E)::QAR2(B)
      • Refutation
        • K(b);S_FLIGHT,XB(A)
    • Try
      • B(A);
      • Vars
        • P(a);SBLOCK::QAR2(B)
      • Refutation
        • P(a);XP(C)
    • Try
      • B(A);
      • Vars
        • K(b);S_FLIGHT,XP(E)::QAR2(B)
        • P(a);SBLOCK::QAR2(B)
      • Refutation
        • P(a);XP(C)
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB1(B)
      • Refutation
        • P(a);P_SPINP(a)
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P_SPINP(a),S_FLIGHT::QAR1(B),XP(a)
      • Refutation
        • K(b);S_FLIGHT,XQ(B)
  • Actual
    • Q(B);
    • Vars
      • K(b);P_SPINP(a),S_FLIGHT::QAR1(B),XP(a)
      • K(b);S_FLIGHT,XP(E)::QAB1(B)
      • P(a);N_GUARD,XP(C)::B(A)
      • P(a);SBLOCK::QAB1(B)
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