MESON Chess Problem Database

Problem Display
PID: 51850 (8/3pp3/2p3p1/3pk1p1/3RN1K1/B7/1Q6/8 w - - 0 1)

Markov, Evgeny Viktorovich

The Problemist, 2004

(First published on Thu Jan 1 2004)

8/3pp3/2p3p1/3pk1p1/3RN1K1/B7/1Q6/8

#2

5 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...dxe4
      • 2.Rd6#
    • 1...e6
      • 2.Bd6#
  • Tries
    • 1.Sxg5?
      • threat
        • 2.Re4#
      • 1...Kf6
        • 2.Rf4#
      • 1...c5!
    • 1.Rd1+?
      • 1...Kxe4
        • 2.Qd4#
        • 2.Qe2#
      • 1...Ke6
        • 2.Sxg5#
      • 1...d4!
    • 1.Rd2+?
      • 1...Kxe4
        • 2.Qd4#
      • 1...Ke6
        • 2.Sxg5#
      • 1...d4!
    • 1.Rd3+?
      • 1...Kxe4
        • 2.Qd4#
        • 2.Qe2#
      • 1...Ke6
        • 2.Sxg5#
      • 1...d4!
    • 1.Ra4+?
      • 1...Ke6
        • 2.Sxg5#
      • 1...d4!
    • 1.Rc4+?
      • 1...Ke6
        • 2.Sxg5#
      • 1...d4!
  • Keys
    • 1.Sc5!
      • 1...Kd6
        • 2.Qb8#
      • 1...Kf6
        • 2.Rf4#
      • 1...d6
        • 2.Re4#
      • 1...e6
        • 2.Sxd7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • P(a);OGATE,SBLOCK,XS(D)::QAB(A)+R(C)
    • P(g);N_GUARD,SBLOCK::B(B)
  • Tries
    • Try
      • S(D);XP(c)
      • Threat
        • QAB(A)+R(C),DCHECK
      • Vars
        • K(b);S_FLIGHT::QAB(A)+R(C),DCHECK
      • Refutation
        • P(d);
    • Try
      • R(C);CHECK
      • Vars
        • K(b);P-FLIGHT::S(D),XP(c)
      • Refutation
        • P(a);P_SPINP(a)
    • Try
      • R(C);CHECK
      • Vars
        • K(b);P-FLIGHT,XS(D)::QAR1(A)
        • K(b);P-FLIGHT::S(D),XP(c)
      • Refutation
        • P(a);P_SPINP(a)
    • Try
      • R(C);CHECK
      • Vars
        • K(b);P-FLIGHT::S(D),XP(c)
      • Refutation
        • P(a);P_SPINP(a)
    • Try
      • R(C);CHECK
      • Vars
        • K(b);P-FLIGHT::S(D),XP(c)
      • Refutation
        • P(a);P_SPINP(a)
    • Try
      • R(C);CHECK
      • Vars
        • K(b);P-FLIGHT::S(D),XP(c)
      • Refutation
        • P(a);P_SPINP(a)
  • Actual
    • S(D);
    • Vars
      • K(b);P_SPINP(a),S_FLIGHT::QAB(A)
      • K(b);S_FLIGHT::QAB(A)+R(C),DCHECK
      • P(f);SBLOCK::QAB(A)+R(C),DCHECK
      • P(g);SBLOCK::S(D),XP(f)
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