MESON Chess Problem Database

Problem Display
PID: 159570 (4r3/1p1p2p1/1K1Q2p1/1b3kp1/8/5n1P/B1nN2N1/B2r4 w - - 0 1)

Alestra, A

Il Due Mosse, 1954

4r3/1p1p2p1/1K1Q2p1/1b3kp1/8/5n1P/B1nN2N1/B2r4

#2

7 + 11

15148 Sadier Collection 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Re1
      • 2.Qf8#
    • 1...Re2
      • 2.Qf8#
    • 1...Re3
      • 2.Qf8#
    • 1...Re4
      • 2.Qf8#
    • 1...Re5
      • 2.Qf8#
    • 1...Rf8
      • 2.Qxf8#
    • 1...g4
      • 2.Qf4#
  • Tries
    • 1.Se3+?
      • 1...Rxe3
        • 2.Qf8#
      • 1...Sxe3!
    • 1.Qd3+?
      • 1...Re4
        • 2.Qxe4#
      • 1...Bxd3!
    • 1.Qd5+?
      • 1...Re5
        • 2.Qxf3#
        • 2.Qf7#
      • 1...Se5!
    • 1.Qxd7+?
      • 1...Re6+
        • 2.Bxe6#
        • 2.Qxe6#
      • 1...Bxd7!
  • Keys
    • 1.Se4!
      • threat
        • 2.Sg3#
      • 1...Rxd6+
        • 2.Sxd6#
      • 1...Kxe4
        • 2.Qxg6#
      • 1...Rxe4
        • 2.Qf8#
      • 1...g4
        • 2.Qf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • R(k);N_GUARD::QAR(G)
    • R(k);N_GUARD::QAR(G),XR(k)
    • P(f);N_GUARD::QAR1(G)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • R(k);XS(D)::QAR(G)
      • Refutation
        • S(b);XS(D)
    • Try
      • Q(G);CHECK
      • Vars
        • R(k);N_GUARD,P_SPINR(k)::QAB1(G),XR(k)
      • Refutation
        • B(d);XQ(G)
    • Try
      • Q(G);CHECK
      • Refutation
        • S(c);P_SPINS(c)
    • Try
      • Q(G);CHECK,XP(i)
      • Refutation
        • B(d);XQ(G)
  • Actual
    • S(C);
    • Threat
      • S(C)
    • Vars
      • R(a);CHECK,XQ(G)::S(C),XR(a)
      • K(e);S_FLIGHT,XS(C)::QAB(G),XP(g)
      • R(k);N_GUARD,SBLOCK,XS(C)::QAR(G)
      • P(f);N_GUARD::QAR1(G)
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Developed and maintained by Brian Stephenson.
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