MESON Chess Problem Database

Problem Display
PID: 177947 (3nK3/8/1p3R2/b4p2/N1nkPP2/4R3/1N2PP2/6Q1 w - - 0 1)

Popov, Valery

1st Comm., Sahs (Latvia), 1989

3nK3/8/1p3R2/b4p2/N1nkPP2/4R3/1N2PP2/6Q1

#2

10 + 6

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sd2
      • 2.Rd6#
    • 1...Sa3
      • 2.Rd6#
    • 1...Se5
      • 2.Rd6#
    • 1...Sd6+
      • 2.Rxd6#
  • Tries
    • 1.Qb1?
      • threat
        • 2.Qd3#
      • 1...Sd6+
        • 2.Rxd6#
      • 1...fxe4
        • 2.Qxe4#
      • 1...Se5
        • 2.Rd6#
      • 1...Sxb2!
    • 1.Qc1?
      • threat
        • 2.Qxc4#
      • 1...Sd6+
        • 2.Rxd6#
      • 1...Sxb2
        • 2.Rd6#
      • 1...Sxe3
        • 2.Qxe3#
      • 1...Bc3
        • 2.Qxc3#
      • 1...Sd2
        • 2.Rd6#
      • 1...Sa3
        • 2.Rd6#
      • 1...Se5
        • 2.Rd6#
      • 1...b5!
    • 1.Qd1+?
      • 1...Sd2
        • 2.Rd6#
      • 1...Bd2!
    • 1.Qg7?
      • threat
        • 2.Rd6#
      • 1...Sd6+
        • 2.Rxd6#
      • 1...Sxb2
        • 2.Rc6#
      • 1...Sxe3
        • 2.Re6#
      • 1...Se6!
  • Keys
    • 1.f3!
      • threat
        • 2.Rd3#
      • 1...Sd6+
        • 2.Rxd6#
      • 1...Sxb2
        • 2.Rc3#
      • 1...Sxe3
        • 2.Rd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • S(a);N_GUARD::R(I)
    • S(a);CHECK,N_GUARD::R(I),XS(a)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • S(a);CHECK,N_GUARD::R(I),XS(a)
        • P(d);OGATE,XP(G)::QAR1(A),XP(d)
        • S(a);N_GUARD::R(I)
      • Refutation
        • S(a);XS(B)
    • Try
      • Q(A);
      • Threat
        • QAR1(A),XS(a)
      • Vars
        • S(a);CHECK,N_GUARD::R(I),XS(a)
        • S(a);N_GUARD,XS(B)::R(I)
        • S(a);OGATE,XR(E)::QAB1(A),XS(a)
        • B(c);N_GUARD::QAB1(A),XB(c)
        • S(a);N_GUARD::R(I)
      • Refutation
        • P(e);
    • Try
      • Q(A);CHECK
      • Vars
        • S(a);P_SPINS(a)::R(I)
      • Refutation
        • B(c);P_SPINB(c)
    • Try
      • Q(A);
      • Threat
        • QAB(A)+R(I),DCHECK
      • Vars
        • S(a);CHECK::QAB(A)+R(I),DCHECK,XS(a)
        • S(a);N_GUARD,XS(B)::QAB(A)+R(I)
        • S(a);N_GUARD,XR(E)::QAB(A)+R(I)
      • Refutation
        • S(f);
  • Actual
    • P(D);
    • Threat
      • QAB(A)+R(E),DCHECK
    • Vars
      • S(a);CHECK,N_GUARD::R(I),XS(a)
      • S(a);N_GUARD,XS(B)::QAB(A)+R(E)
      • S(a);N_GUARD,P_SPINS(a),XR(E)::R(I)
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