MESON Chess Problem Database

Problem Display
PID: 199514 (1B6/2R5/3kp2P/3p2p1/8/8/1K2Q3/8 w - - 0 1)

Sawionok, Aleksandr

Rhein-Main Presse, 2001

(First published on Sat Feb 17 2001)

1B6/2R5/3kp2P/3p2p1/8/8/1K2Q3/8

#2

5 + 4

16210 Problemschach-Jahrbuch (2001) 2002
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...e5
      • 2.Qa6#
  • Tries
    • 1.Rb7+?
      • 1...Kc6
        • 2.Qb5#
      • 1...Kc5!
    • 1.Qd3?
      • 1...Ke5
        • 2.Rf7#
      • 1...d4
        • 2.Qxd4#
      • 1...e5
        • 2.Qa6#
        • 2.Qg6#
      • 1...g4!
    • 1.Qc4?
      • threat
        • 2.Ra7#
        • 2.Rb7#
        • 2.Rf7#
        • 2.Rg7#
        • 2.Rh7#
      • 1...Ke5
        • 2.Rf7#
      • 1...e5
        • 2.Qa6#
        • 2.Qc6#
      • 1...dxc4!
    • 1.Qb5?
      • threat
        • 2.Ra7#
        • 2.Rb7#
        • 2.Rd7#
        • 2.Rf7#
        • 2.Rg7#
        • 2.Rh7#
      • 1...e5
        • 2.Qa6#
        • 2.Qc6#
        • 2.Qd7#
        • 2.Qb6#
      • 1...Ke5!
    • 1.Qc2?
      • threat
        • 2.Ra7#
        • 2.Rb7#
        • 2.Rf7#
        • 2.Rg7#
        • 2.Rh7#
      • 1...d4
        • 2.Qc5#
      • 1...e5
        • 2.Qg6#
        • 2.Qc6#
      • 1...Ke5!
    • 1.Qf2?
      • 1...Ke5
        • 2.Rc4#
      • 1...d4
        • 2.Qxd4#
      • 1...e5
        • 2.Qb6#
        • 2.Qf6#
      • 1...g4!
    • 1.Qe3?
      • 1...d4
        • 2.Qxd4#
      • 1...e5
        • 2.Qb6#
      • 1...g4!
  • Keys
    • 1.Qg4!
      • 1...Ke5
        • 2.Rf7#
      • 1...d4
        • 2.Qxd4#
      • 1...e5
        • 2.Qd7#

This anticipates 200780(2001)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(d);SBLOCK::QAR(B)
  • Tries
    • Try
      • R(D);CHECK
      • Vars
        • K(c);P-FLIGHT::QAB1(B)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(B);P_PINP(a)
      • Vars
        • K(c);N_SPINP(a),S_FLIGHT::B(E)+R(D)
        • P(a);OGATEB::QAR2(B),XP(a)
      • Refutation
        • P(b);
    • Try
      • Q(B);
      • Threat
        • DUALS(5)
      • Vars
        • K(c);S_FLIGHT::B(E)+R(D)
      • Refutation
        • P(a);XQ(B)
    • Try
      • Q(B);
      • Threat
        • DUALS(6)
      • Refutation
        • K(c);P_SPINP(a),S_FLIGHT
    • Try
      • Q(B);
      • Threat
        • DUALS(5)
      • Vars
        • P(a);::QAB1(B)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(B);
      • Vars
        • K(c);S_FLIGHT::B(E)+R(D)
        • P(a);OGATEB::QAR2(B),XP(a)
      • Refutation
        • P(b);
    • Try
      • Q(B);
      • Vars
        • P(a);OGATEB::QAR2(B),XP(a)
        • P(d);SBLOCK::QAR2(B)
      • Refutation
        • P(b);
  • Actual
    • Q(B);
    • Vars
      • K(c);S_FLIGHT::B(E)+R(D)
      • P(a);OGATEB::QAR2(B),XP(a)
      • P(d);OGATE,SBLOCK::QAR1(B)
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