MESON Chess Problem Database

Problem Display
PID: 103295 (2b1rb2/3p2p1/2RN2N1/1PnkB3/4p1Q1/1R6/K7/5n2 w - - 0 1)

Leun, Evgeny

Marandiuk, Mikhail Nazarovich

Sachove umeni (Ceskoslovensky sach), 1976

2b1rb2/3p2p1/2RN2N1/1PnkB3/4p1Q1/1R6/K7/5n2

#2

8 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Se6
      • 2.Qxe4#
    • 1...e3
      • 2.Qc4#
  • Tries
    • 1.Sc4?
      • threat
        • 2.Sb6#
      • 1...Kxc4
        • 2.Qxe4#
      • 1...Sa4
        • 2.Sf4#
      • 1...Rxe5!
    • 1.Rd3+?
      • 1...exd3
        • 2.Qc4#
      • 1...Sxd3!
    • 1.Rb4?
      • threat
        • 2.Rd4#
      • 1...Rxe5
        • 2.Sf4#
      • 1...Se6
        • 2.Qxe4#
      • 1...Sb3!
    • 1.Qxe4+?
      • 1...Ke6
        • 2.Qc4#
      • 1...Sxe4!
  • Keys
    • 1.Sxe4!
      • threat
        • 2.Sc3#
      • 1...Kc4
        • 2.Sf6#
      • 1...Sxe4
        • 2.Rd3#
      • 1...Sa4
        • 2.Rd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • S(c);N_GUARD,SBLOCK::QAB1(C),XP(b)
    • P(b);OGATE::QAB1(C)
  • Tries
    • Try
      • S(G);
      • Threat
        • S(G)
      • Vars
        • K(d);P_SPINP(b),P_SPINS(c),S_FLIGHT,XS(G)::QAR2(C),XP(b)
        • S(c);::S(H)
      • Refutation
        • R(h);XB(E)
    • Try
      • R(B);CHECK
      • Vars
        • P(b);OGATE,XR(B)::QAB1(C)
      • Refutation
        • S(c);XR(B)
    • Try
      • R(B);
      • Threat
        • R1(B)
      • Vars
        • R(h);SBLOCK,XB(E)::S(H)
        • S(c);N_GUARD,SBLOCK::QAB1(C),XP(b)
      • Refutation
        • S(c);
    • Try
      • Q(C);CHECK,XP(b)
      • Vars
        • K(d);S_FLIGHT::QAB(C)
      • Refutation
        • S(c);XQ(C)
  • Actual
    • S(G);XP(b)
    • Threat
      • S(G)
    • Vars
      • K(d);P_SPINS(c),S_FLIGHT::QAR(C)+S(G)
      • S(c);N_GUARD,XS(G)::R(B)
      • S(c);N_GUARD::R(B)
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