MESON Chess Problem Database

Problem Display
PID: 77447 (8/p7/R7/1p3k2/1P3P2/2PpPr1p/3P1N1P/3Q2KN w - - 0 1)

Pituk, Alexander

3rd Prize, Praca, 1954

8/p7/R7/1p3k2/1P3P2/2PpPr1p/3P1N1P/3Q2KN

#2

11 + 6

5658 Beispiele zur Ideengeschichte des Schachproblems (Josef Breuer) 1982
133 The Problemist Supplement 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Rxf2
      • 2.Sg3#
    • 1...Rxe3
      • 2.Qg4#
    • 1...Rg3+
      • 2.Sxg3#
    • 1...Rxf4
      • 2.Qh5#
  • Tries
    • 1.Kf1?
      • 1...Rxe3
        • 2.Qg4#
      • 1...Rxf4
        • 2.Qh5#
      • 1...Rg3
        • 2.Sxg3#
      • 1...Rxf2+!
    • 1.Qe2?
      • threat
        • 2.Qxd3#
      • 1...Rg3+
        • 2.Sxg3#
      • 1...Rxf2
        • 2.Sg3#
      • 1...Rxe3
        • 2.Qg4#
      • 1...Rxf4
        • 2.Qh5#
      • 1...dxe2!
    • 1.c4?
      • 1...Rg3+
        • 2.Sxg3#
      • 1...Rxf2
        • 2.Sg3#
      • 1...Rxe3
        • 2.Qg4#
      • 1...Rxf4
        • 2.Qh5#
      • 1...bxc4!
  • Keys
    • 1.Qb3!
      • threat
        • 2.Qd5#
        • 2.Qe6#
        • 2.Qf7#
      • 1...Rg3+
        • 2.Sxg3#
      • 1...Rxf2
        • 2.Qe6#
      • 1...Rxe3
        • 2.Qf7#
      • 1...Rxf4
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • R(b);N_GUARD,XS(E)::S(C)
    • R(b);OGATE,XP(H)::QAB1(A)
    • R(b);CHECK,N_GUARD::S(C),XR(b)
    • R(b);OGATE,XP(J)::QAR2(A)
  • Tries
    • Try
      • K(B);P-FLIGHT,P_SPINS(E)
      • Vars
        • R(b);N_PINS(E),OGATE,XP(H)::QAB1(A)
        • R(b);OGATE,XP(J)::QAR2(A)
        • R(b);N_GUARD,N_PINS(E)::S(C),XR(b)
      • Refutation
        • R(b);CHECK,XS(E)
    • Try
      • Q(A);
      • Threat
        • QAB(A),XP(a)
      • Vars
        • R(b);CHECK,N_GUARD::S(C),XR(b)
        • R(b);N_GUARD,XS(E)::S(C)
        • R(b);OGATE,XP(H)::QAB1(A)
        • R(b);OGATE,XP(J)::QAR2(A)
      • Refutation
        • P(a);XQ(A)
    • Try
      • P(G);
      • Vars
        • R(b);CHECK,N_GUARD::S(C),XR(b)
        • R(b);N_GUARD,XS(E)::S(C)
        • R(b);OGATE,XP(H)::QAB1(A)
        • R(b);OGATE,XP(J)::QAR2(A)
      • Refutation
        • P(d);XP(G)
  • Actual
    • Q(A);
    • Threat
      • DUALS(3)
    • Vars
      • R(b);CHECK,N_GUARD::S(C),XR(b)
      • R(b);XS(E)::QAB1(A)
      • R(b);XP(H)::QAR2(A)
      • R(b);XP(J)::QAR2(A)
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