MESON Chess Problem Database

Problem Display
PID: 235463 (2n5/5p1R/3pk3/6P1/B2pK3/Bp6/4Q3/8 w - - 0 1)

Shanshin, Valery Yurevich

Schach, 1983

2n5/5p1R/3pk3/6P1/B2pK3/Bp6/4Q3/8

#2

6 + 6

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...d5+
      • 2.Kf4#
    • 1...f5+
      • 2.Kxd4#
    • 1...f6
      • 2.Bd7#
  • Tries
    • 1.Kd3+?
      • 1...Kd5
        • 2.Qe4#
      • 1...Kf5!
    • 1.Qc4+?
      • 1...d5+
        • 2.Qxd5#
      • 1...Ke7!
    • 1.Qg4+?
      • 1...f5+
        • 2.Qxf5#
      • 1...Ke7!
  • Keys
    • 1.Qb5!
      • threat
        • 2.Qd7#
      • 1...d5+
        • 2.Qxd5#
      • 1...f5+
        • 2.Qxf5#
      • 1...Ke7
        • 2.Qe8#
      • 1...Sb6
        • 2.Qe8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • P(c);CHECK,SBLOCK::QAR(A)+K(D)
    • P(e);CHECK,SBLOCK::QAR(A)+K(D),XP(b)
    • P(e);::B(C)
  • Tries
    • Try
      • K(D);CHECK,S_FLIGHT
      • Vars
        • K(d);S_FLIGHT::QAB1(A)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • P(c);CHECK,P_SPINP(c)::QAB1(A),XP(c)
      • Refutation
        • K(d);P-FLIGHT,P_SPINP(c)
    • Try
      • Q(A);CHECK
      • Vars
        • P(e);CHECK,P_SPINP(e)::QAB1(A),XP(e)
      • Refutation
        • K(d);P-FLIGHT,P_SPINP(c)
  • Actual
    • Q(A);
    • Threat
      • QAB1(A)
    • Vars
      • P(c);CHECK::QAB1(A),XP(c)
      • P(e);CHECK::QAB1(A),XP(e)
      • K(d);P-FLIGHT,P_SPINP(c)::QAR1(A)
      • S(f);N_GUARD::QAR2(A)
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