MESON Chess Problem Database

Problem Display
PID: 42475 (4Q1br/4n3/3B1p2/1N1k1P2/2p1p1P1/4R3/2K3P1/3B1N2 w - - 0 1)

Leun, Evgeny

Marandiuk, Mikhail Nazarovich

Veders, Visvaldis M

4th Prize, 64 Shakhmatnoe obozrenie, 1975

4Q1br/4n3/3B1p2/1N1k1P2/2p1p1P1/4R3/2K3P1/3B1N2

#2

10 + 7

3771 FIDE Album (1974-1976) 1980
133 The Problemist Supplement 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Sxf5
      • 2.Qxe4#
    • 1...Sc6
      • 2.Qxe4#
    • 1...Sg6
      • 2.Qxe4#
      • 2.Qa8#
    • 1...Sc8
      • 2.Qxe4#
  • Tries
    • 1.Sc3+?
      • 1...Kd4
        • 2.Rxe4#
      • 1...Kxd6!
    • 1.Re1?
      • threat
        • 2.Se3#
      • 1...Sxf5
        • 2.Qxe4#
      • 1...e3
        • 2.Bf3#
      • 1...Rh3!
    • 1.Rf3?
      • threat
        • 2.Se3#
      • 1...Sxf5
        • 2.Rxf5#
      • 1...exf3
        • 2.Bxf3#
      • 1...e3!
    • 1.Rg3?
      • threat
        • 2.Se3#
      • 1...e3
        • 2.Bf3#
      • 1...Sxf5!
    • 1.Qxe7?
      • threat
        • 2.Qxe4#
        • 2.Qb7#
      • 1...c3
        • 2.Qxe4#
      • 1...Rh7
        • 2.Qxe4#
      • 1...Be6
        • 2.Qb7#
      • 1...Kc6!
  • Keys
    • 1.Rxe4!
      • threat
        • 2.Rd4#
      • 1...Kxe4
        • 2.Bf3#
      • 1...Sxf5
        • 2.Qa8#
      • 1...Sc6
        • 2.Se3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • S(e);OGATE,XP(H)::QAB1(J),XP(b)
    • S(e);OGATE,SBLOCK::QAB1(J),XP(b)
    • S(e);OGATE::QAB1(J),XP(b)
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • K(c);P-FLIGHT::R1(E),XP(b)
      • Refutation
        • K(c);P-FLIGHT,XB(I)
    • Try
      • R(E);
      • Threat
        • S(B)
      • Vars
        • S(e);OGATE,XP(H)::QAB1(J),XP(b)
        • P(b);OGATEB::B(A)
      • Refutation
        • R(g);
    • Try
      • R(E);
      • Threat
        • S(B)
      • Vars
        • S(e);OGATE,XP(H)::R(E),XS(e)
        • P(b);OGATE,XR(E)::B(A),XP(b)
      • Refutation
        • P(b);
    • Try
      • R(E);
      • Threat
        • S(B)
      • Vars
        • P(b);OGATEB::B(A)
      • Refutation
        • S(e);XP(H)
    • Try
      • Q(J);XS(e)
      • Threat
        • DUALS(2)
      • Vars
        • P(a);::QAB1(J),XP(b)
        • R(g);::QAB1(J),XP(b)
        • B(f);::QAB(J)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • R(E);XP(b)
    • Threat
      • R1(E)
    • Vars
      • K(c);OGATEB,P_SPINS(e),S_FLIGHT,XR(E)::B(A)
      • S(e);N_GUARD,XP(H)::QAB(J)
      • S(e);::S(B)
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