MESON Chess Problem Database

Problem Display
PID: 144913 (1bQ2R2/n5p1/3P3r/4k1N1/KPP3PP/6p1/1N1P1q2/B7 w - - 0 1)

Gulyaev, Aleksandr Pavlovich (aka Grin, AP)

Grantham Journal, 1928

(First published on Sat Jul 21 1928)

1bQ2R2/n5p1/3P3r/4k1N1/KPP3PP/6p1/1N1P1q2/B7

#2

12 + 7

14868 Pirnie Collection 2012

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4
      • 2.Qc5#
    • 1...Qe1
      • 2.Qc5#
    • 1...Qc5
      • 2.Qxc5#
    • 1...Qf1
      • 2.Qc5#
    • 1...Qe2
      • 2.Qc5#
    • 1...Qh2
      • 2.Qc5#
    • 1...Qf4
      • 2.Qc5#
    • 1...Rxd6
      • 2.Sd3#
    • 1...Bxd6
      • 2.Sd3#
  • Tries
    • 1.Sd1+?
      • 1...Qd4
        • 2.Qc5#
      • 1...Kxd6!
    • 1.Re8+?
      • 1...Kd4
        • 2.Re4#
        • 2.Qc5#
      • 1...Kf4
        • 2.Sd3#
        • 2.Re4#
        • 2.Qf5#
      • 1...Kxd6
        • 2.Se4#
      • 1...Kf6
        • 2.Re6#
        • 2.Qe6#
      • 1...Re6!
    • 1.Qe6+?
      • 1...Kd4
        • 2.Qd5#
        • 2.Qe4#
      • 1...Rxe6!
    • 1.Qc6?
      • threat
        • 2.Sd3#
        • 2.Qd5#
      • 1...Kd4
        • 2.Qe4#
        • 2.Qd5#
        • 2.Qc5#
      • 1...Qxd2
        • 2.Sd3#
      • 1...Qxf8
        • 2.Sd3#
      • 1...Rxd6
        • 2.Sd3#
        • 2.Qe4#
      • 1...Qf5
        • 2.Sd3#
      • 1...Qf6
        • 2.Sd3#
      • 1...Qf7
        • 2.Sd3#
      • 1...Rf6
        • 2.Sd3#
      • 1...Qd4
        • 2.Sd3#
        • 2.Rf5#
      • 1...Qc5
        • 2.Sd3#
        • 2.Qxc5#
      • 1...Qg2
        • 2.Sd1#
        • 2.Sd3#
      • 1...Qf3
        • 2.Sd3#
      • 1...Sxc6!
    • 1.Qc7?
      • threat
        • 2.Sd3#
      • 1...Kd4
        • 2.Qc5#
      • 1...Bxc7!
  • Keys
    • 1.Rd8!
      • threat
        • 2.Sd3#
      • 1...Kd4
        • 2.Qc5#
      • 1...Kf4
        • 2.Sd3#
        • 2.Qf5#
      • 1...Kf6
        • 2.Qe6#
      • 1...Qd4
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 8
  • Sets
    • K(c);S_FLIGHT::QAB1(K)
    • Q(a);N_GUARD::QAR2(K)
    • Q(a);N_GUARD::QAR2(K),XQ(a)
    • R(d);SBLOCK,XP(J)::B(A)+S(B),DCHECK
    • B(g);SBLOCK,XP(J)::B(A)+S(B),DCHECK
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • Q(a);P_SPINQ(a)::QAR2(K)
      • Refutation
        • K(c);S_FLIGHT,XP(J)
    • Try
      • R(L);CHECK
      • Vars
        • K(c);S_FLIGHT,XP(J)::S(I)
      • Refutation
        • R(d);P_SPINR(d)
    • Try
      • Q(K);CHECK
      • Refutation
        • R(d);XQ(K)
    • Try
      • Q(K);
      • Threat
        • DUALS(2)
      • Vars
        • Q(a);XP(C)::B(A)+S(B),DCHECK
        • Q(a);XR(L)::B(A)+S(B),DCHECK
        • Q(a);::B(A)+S(B),DCHECK
        • R(d);::B(A)+S(B),DCHECK
      • Refutation
        • S(e);XQ(K)
    • Try
      • Q(K);
      • Threat
        • B(A)+S(B),DCHECK
      • Vars
        • K(c);S_FLIGHT::QAB1(K)
      • Refutation
        • B(g);XQ(K)
  • Actual
    • R(L);
    • Threat
      • B(A)+S(B),DCHECK
    • Vars
      • K(c);S_FLIGHT::QAB1(K)
      • K(c);S_FLIGHT::QAR1(K)
      • Q(a);N_GUARD,SBLOCK::QAR1(K)
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