MESON Chess Problem Database

Problem Display
PID: 177822 (Q4RB1/2K1p3/1pn3p1/4k1pN/4p1P1/B1P5/2pP2R1/1bN5 w - - 0 1)

Subota, Nikolai

Sahs (Latvia), 1983

Q4RB1/2K1p3/1pn3p1/4k1pN/4p1P1/B1P5/2pP2R1/1bN5

#2

11 + 9

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sd4
      • 2.Qd5#
    • 1...Sa5
      • 2.Qd5#
    • 1...Sa7
      • 2.Qd5#
    • 1...Sb8
      • 2.Qd5#
    • 1...Sd8
      • 2.Qd5#
    • 1...gxh5
      • 2.Rf5#
  • Tries
    • 1.Re2?
      • threat
        • 2.Sd3#
      • 1...e3
        • 2.Rxe3#
      • 1...Sb4
        • 2.Rxe4#
        • 2.Qxe4#
        • 2.d4#
      • 1...e6!
    • 1.Qxc6?
      • threat
        • 2.Qb5#
        • 2.Qd5#
        • 2.Qe6#
      • 1...e3
        • 2.Sd3#
        • 2.Qd5#
        • 2.Qe6#
        • 2.d4#
      • 1...b5
        • 2.Qxb5#
        • 2.Qd5#
        • 2.Qc5#
        • 2.Qe6#
      • 1...e6
        • 2.Bd6#
        • 2.Qb5#
        • 2.Qd6#
        • 2.Qxe6#
      • 1...Ba2!
    • 1.Qe8?
      • threat
        • 2.Bd6#
      • 1...e6
        • 2.Qxe6#
      • 1...Sb4
        • 2.Qxe7#
      • 1...e3!
    • 1.d4+?
      • 1...Sxd4
        • 2.Qd5#
      • 1...exd4 ep!
  • Keys
    • 1.Sf6!
      • threat
        • 2.Sd7#
      • 1...Kf4
        • 2.Sd7#
      • 1...exf6
        • 2.Bd6#
      • 1...Sb8
        • 2.Qxe4#
      • 1...e3
        • 2.Sd3#
      • 1...e6
        • 2.Bd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • S(g);OGATE::QAR1(I)
    • P(h);N_GUARD,XS(G)::R1(J)
  • Tries
    • Try
      • R(C);P_PINP(c)
      • Threat
        • S(A)
      • Vars
        • P(c);OGATEB::R(C),XP(c)
      • Refutation
        • P(i);
    • Try
      • Q(I);XS(g)
      • Threat
        • DUALS(3)
      • Refutation
        • B(a);
    • Try
      • Q(I);P_PINP(i)
      • Threat
        • B(D)
      • Vars
        • P(i);OGATE::QAR1(I),XP(i)
        • S(g);N_GUARD::QAR2(I),XP(i)
      • Refutation
        • P(c);
    • Try
      • P(B);CHECK
      • Vars
        • S(g);OGATE,XP(B)::QAR1(I)
      • Refutation
        • P(c);EP,XP(B)
  • Actual
    • S(G);
    • Threat
      • S(G)
    • Vars
      • K(d);S_FLIGHT::R(J)+S(G)
      • P(i);N_GUARD,XS(G)::B(D)
      • S(g);OGATE::QAR1(I),XP(c)
      • P(c);N_GUARD::S(A)
      • P(i);N_GUARD::B(D)
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