MESON Chess Problem Database

Problem Display
PID: 17988 (6B1/8/8/4K3/8/pNQ5/kpn1N3/B7 w - - 0 1)

Yaroslavtsev, Arkady Ivanovich

Sp. Prize, Shakhmaty v SSSR, 1952

6B1/8/8/4K3/8/pNQ5/kpn1N3/B7

#2

6 + 4

3105 FIDE Album (1945-1955) 1964
3310 2345 Chess Problems 1997

SOLUTION

  • SOUND
  • Sets
    • 1...bxa1Q
      • 2.Sd2#
    • 1...bxa1B
      • 2.Sd2#
    • 1...bxa1R
      • 2.Sd2#
      • 2.Qxc2#
    • 1...b1Q
      • 2.Sbc1#
    • 1...b1S
      • 2.Sec1#
      • 2.Sbc1#
      • 2.Sd2#
      • 2.Sbd4#
      • 2.Sa5#
      • 2.Sc5#
      • 2.Qxc2#
    • 1...b1B
      • 2.Sec1#
      • 2.Sbc1#
      • 2.Sd2#
      • 2.Sbd4#
      • 2.Sa5#
      • 2.Sc5#
    • 1...b1R
      • 2.Sbc1#
  • Tries
    • 1.Sec1+?
      • 1...bxc1Q
        • 2.Sd2#
      • 1...bxc1S
        • 2.Qxc2#
      • 1...bxc1B
        • 2.Sd2#
      • 1...bxc1R
        • 2.Sd2#
      • 1...Kb1!
    • 1.Qd4?
      • threat
        • 2.Sc3#
      • 1...Kb1
        • 2.Sc3#
      • 1...bxa1Q
        • 2.Sd2#
      • 1...bxa1B
        • 2.Sd2#
      • 1...bxa1R
        • 2.Sd2#
      • 1...b1S
        • 2.Sec1#
        • 2.Sbc1#
        • 2.Sd2#
        • 2.Sa5#
        • 2.Sc5#
      • 1...bxa1S!
  • Keys
    • 1.Qb4!
      • threat
        • 2.Sc3#
      • 1...bxa1Q+
        • 2.Sbd4#
      • 1...bxa1B+
        • 2.Sbd4#
      • 1...Kb1
        • 2.Sc3#
      • 1...bxa1S
        • 2.Sbc1#
      • 1...bxa1R
        • 2.Sbc1#
        • 2.Sd2#
        • 2.Sbd4#
        • 2.Sa5#
        • 2.Sc5#
      • 1...b1S
        • 2.Sec1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • P(b);P_PINQ(D),XB(A)::B(F)+S(C)
    • P(b);SBLOCK::B(F)+S(C),DCHECK
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • P(b);XS(B)::B(F)+S(C)
        • P(b);XS(B)::QAR2(D),XS(c)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(D);
      • Threat
        • S(B)
      • Vars
        • K(a);S_FLIGHT::S(B)
        • P(b);P_PINQ(D),XB(A)::B(F)+S(C)
        • P(b);XB(A)::B(F)+S(C)
      • Refutation
        • P(b);XB(A)
  • Actual
    • Q(D);
    • Threat
      • S(B)
    • Vars
      • P(b);CHECK,SBLOCK,XB(A)::B(F)+S(C)
      • K(a);S_FLIGHT::S(B)
      • P(b);SBLOCK,XB(A)::B(F)+S(C),DCHECK
      • P(b);N_GUARD,SBLOCK::S(B)
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