MESON Chess Problem Database

Problem Display
PID: 43513 (B5R1/8/1B6/3b4/5NK1/2n5/p3R2N/Qq5k w - - 0 1)

Leites, Samuil Davidovich

Loshinski, Lev Ilich

Umnov, Evgeny Ivanovich

De Problemist, 1930

B5R1/8/1B6/3b4/5NK1/2n5/p3R2N/Qq5k

#2

8 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Qe1
      • 2.Qxe1#
    • 1...Qf1
      • 2.Qxf1#
    • 1...Qg1+
      • 2.Qxg1#
    • 1...Bf3+
      • 2.Bxf3#
    • 1...Sa4
      • 2.Bxd5#
    • 1...Sb5
      • 2.Bxd5#
  • Tries
    • 1.Sf3?
      • threat
        • 2.Rh2#
        • 2.Rh8#
      • 1...Qg1+
        • 2.Qxg1#
      • 1...Bxf3+
        • 2.Bxf3#
      • 1...Bxg8
        • 2.Rh2#
      • 1...Sxe2
        • 2.Rh8#
      • 1...Be4
        • 2.Rh2#
      • 1...Bf7
        • 2.Rh2#
      • 1...Sd1
        • 2.Re1#
        • 2.Rh2#
      • 1...Be6+!
    • 1.Bxd5+?
      • 1...Se4
        • 2.Bxe4#
      • 1...Sxd5!
  • Keys
    • 1.Rh8!
      • threat
        • 2.Sf3#
      • 1...Qg1+
        • 2.Qxg1#
      • 1...Bf3+
        • 2.Sxf3#
        • 2.Bxf3#
      • 1...Bg2
        • 2.Bxg2#
      • 1...Be4
        • 2.Sf1#
      • 1...Sd1
        • 2.Re1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • Q(a);OGATE::QAR(A),XQ(a)
    • Q(a);OGATE::QAR2(A),XQ(a)
    • Q(a);CHECK,OGATE::QAR1(A),XQ(a)
    • B(e);CHECK,OGATE::B(G),XB(e)
    • S(d);N_GUARD::B(G),XB(e)
  • Tries
    • Try
      • S(C);N_PINB(e)
      • Threat
        • DUALS(2)
      • Vars
        • Q(a);CHECK,OGATE::QAR1(A),XQ(a)
        • B(e);CHECK,OGATE,P_SPINB(e),XS(C)::B(G),XB(e)
        • B(e);XR(H)::R1(B)
        • S(d);XR(B)::R(H)
        • B(e);::R1(B)
      • Refutation
        • B(e);CHECK
    • Try
      • B(G);CHECK,XB(e)
      • Vars
        • S(d);N_GUARD,P_SPINS(d)::B(G),XS(d)
      • Refutation
        • S(d);XB(G)
  • Actual
    • R(H);
    • Threat
      • R(H)+S(C)
    • Vars
      • Q(a);CHECK,OGATE::QAR1(A),XQ(a)
      • B(e);OGATE::B(G),XB(e)
      • B(e);::R(H)+S(C)
      • S(d);N_SPINQ(a),S_CUTQ(a)::R(B)
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