MESON Chess Problem Database

Problem Display
PID: 71128 (3r2b1/3p1PK1/N1pkr2R/4pP2/1P1qp1PB/3NpPQ1/B7/3R4 w - - 0 1)

Isaev, Leonid Antonovich

Western Morning News, 1927

(First published on Sat Jan 8 1927)

3r2b1/3p1PK1/N1pkr2R/4pP2/1P1qp1PB/3NpPQ1/B7/3R4

#2

13 + 10

15239 Valois Notebooks 2024

SOLUTION

  • SOUND
  • Sets
    • 1...Qb2
      • 2.Sxb2#
    • 1...Qc5
      • 2.Sdxc5#
      • 2.bxc5#
    • 1...Qb6
      • 2.Sdc5#
      • 2.Qxe5#
    • 1...Qa7
      • 2.Sdc5#
      • 2.Qxe5#
    • 1...Qxb4
      • 2.Sdxb4#
      • 2.Qxe5#
    • 1...Qc4
      • 2.Qxe5#
    • 1...Rg6+
      • 2.Rxg6#
    • 1...Re8
      • 2.fxe8S#
  • Tries
    • 1.Sdc5?
      • threat
        • 2.Sxe4#
        • 2.Sb7#
        • 2.Rxd4#
      • 1...Rg6+
        • 2.Rxg6#
      • 1...Qxd1
        • 2.Sxe4#
        • 2.Sb7#
      • 1...exf3
        • 2.Se4#
        • 2.Sb7#
        • 2.Rxd4#
      • 1...Qd2
        • 2.Sxe4#
        • 2.Sb7#
      • 1...Qd3
        • 2.Sxe4#
        • 2.Sb7#
      • 1...Qd5
        • 2.Sxe4#
        • 2.Sb7#
      • 1...Rb8
        • 2.Sxe4#
        • 2.Rxd4#
      • 1...Rf6!
  • Keys
    • 1.Sxe5!
      • threat
        • 2.Rxd4#
      • 1...Rg6+
        • 2.Rxg6#
      • 1...Qxd1
        • 2.Sd3#
      • 1...Rf6
        • 2.Sg6#
      • 1...Qd2
        • 2.Sd3#
      • 1...Qd3
        • 2.Sxd3#
      • 1...Qd5
        • 2.Sc4#
      • 1...c5
        • 2.bxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 3
  • Sets
    • Q(b);::R(A)+S(C),XQ(b)
    • Q(b);N_GUARD::QAB1(E),XP(d)
    • R(g);CHECK,OGATEB::R(K),XR(g)
    • R(i);OGATE::PXR(i)=S
  • Tries
    • Try
      • S(C);P_PINQ(b)
      • Threat
        • DUALS(3)
      • Vars
        • R(g);CHECK,OGATEB::R(K),XR(g)
      • Refutation
        • R(g);
  • Actual
    • S(C);P_PINQ(b),P_SPINS(C),XP(d)
    • Threat
      • R(A),XQ(b)
    • Vars
      • R(g);CHECK,OGATEB::R(K),XR(g)
      • Q(b);N_PINS(C),N_SPINQ(b),XR(A)::QAB(E)+S(C)
      • R(g);N_PINS(C)::QAB(E)+S(C)
      • Q(b);N_PINS(C)::QAB(E)+S(C)
      • Q(b);N_PINS(C)::QAB(E)+S(C),XQ(b)
      • Q(b);N_PINS(C)::QAB(E)+S(C),DCHECK
      • P(e);OGATE::P(F),XP(e)
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