MESON Chess Problem Database

Problem Display
PID: 206593 (8/8/2p5/2B5/P3Pp2/p1k2K2/P7/1R2N3 w - - 0 1)

Ovchinnikov, Valentin N

64 Shakhmatnoe obozrenie, 1925

8/8/2p5/2B5/P3Pp2/p1k2K2/P7/1R2N3

#2

7 + 4

5454 Near Snap 2020
6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kd2
      • 2.Bb4#
    • 1...Kc4
      • 2.Rc1#
  • Tries
    • 1.Ke2?
      • 1...Kc4
        • 2.Rc1#
      • 1...f3+!
    • 1.Kf2?
      • 1...Kd2
        • 2.Bb4#
      • 1...Kc4
        • 2.Rc1#
      • 1...f3!
    • 1.Kxf4?
      • 1...Kc4
        • 2.Rc1#
      • 1...Kd2!
    • 1.Rd1?
      • 1...Kc4
        • 2.Rc1#
      • 1...Kb2!
    • 1.a5?
      • 1...Kd2
        • 2.Bb4#
      • 1...Kc4!
    • 1.e5?
      • 1...Kd2
        • 2.Bb4#
      • 1...Kc4!
  • Keys
    • 1.Ra1!
      • 1...Kb2
        • 2.Bd4#
      • 1...Kd2
        • 2.Bb4#
      • 1...Kc4
        • 2.Rc1#

Anticipated by 1953(1859), 4775(1891), 234958(1894), 120937(1898), 57017(1900), 175166(1902), 31183(1902), 181896(1905), 50715(1907), 184830(1908), 189845(1912), 178324(1915), 193481(1915), 75889(1920), 206553(1925)

This anticipates 231389(1927), 76533(1933), 76553(1936), 101951(1939), 19270(1943), 76843(1947), 51132(1950), 184308(1950), 51583(1965), 213018(1967), 121122(1980), 240454(1992)

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(b);S_FLIGHT::B(G)
    • K(b);P-FLIGHT::R(A)
  • Tries
    • Try
      • K(D);S_FLIGHT
      • Vars
        • K(b);P-FLIGHT::R(A)
      • Refutation
        • P(c);CHECK
    • Try
      • K(D);P-FLIGHT
      • Vars
        • K(b);S_FLIGHT::B(G)
        • K(b);P-FLIGHT::R(A)
      • Refutation
        • P(c);
    • Try
      • K(D);P-FLIGHT,XP(c)
      • Vars
        • K(b);P-FLIGHT::R(A)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • R(A);
      • Vars
        • K(b);P-FLIGHT::R(A)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • P(E);
      • Vars
        • K(b);S_FLIGHT::B(G)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • P(F);
      • Vars
        • K(b);S_FLIGHT::B(G)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • R(A);
    • Vars
      • K(b);S_FLIGHT::B(G)
      • K(b);P-FLIGHT::R(A)
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