MESON Chess Problem Database

Problem Display
PID: 90797 (1B6/8/8/3pP2p/N1Bkr2p/1P2p2P/4RpQ1/4nK2 w - - 0 1)

Hermanson, Halvar

Die Schwalbe, 1957

1B6/8/8/3pP2p/N1Bkr2p/1P2p2P/4RpQ1/4nK2

#2

9 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rf4
      • 2.Qxd5#
    • 1...Rg4
      • 2.Qxd5#
    • 1...Rxe5
      • 2.Ba7#
  • Tries
    • 1.Rd2+?
      • 1...Sd3
        • 2.Rxd3#
      • 1...exd2!
    • 1.Qg5?
      • threat
        • 2.Ba7#
      • 1...Rxe5
        • 2.Qxe5#
      • 1...dxc4
        • 2.Qd8#
      • 1...Rf4
        • 2.Qxf4#
      • 1...Rg4
        • 2.Qxe3#
      • 1...Sd3!
    • 1.Qg8?
      • threat
        • 2.Qxd5#
      • 1...dxc4
        • 2.Qxc4#
        • 2.Qd8#
      • 1...Rxe5!
  • Keys
    • 1.Rxe3!
      • 1...Kxe3
        • 2.Qxf2#
      • 1...Rxe3
        • 2.Qxd5#
      • 1...Rxe5
        • 2.Ba7#
      • 1...Sxg2
        • 2.Rd3#
      • 1...dxc4
        • 2.Qxe4#
      • 1...Rf4
        • 2.Ba7#
      • 1...Rg4
        • 2.Ba7#
      • 1...Sc2
        • 2.Rd3#
      • 1...Sd3
        • 2.Rxd3#
      • 1...Sf3
        • 2.Rd3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • R(e);OGATE::QAR1(C),XP(g)
    • R(e);SBLOCK,XP(H)::B(I)
  • Tries
    • Try
      • R(B);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::R1(B),XS(a)
      • Refutation
        • P(c);XR(B)
    • Try
      • Q(C);
      • Threat
        • B(I)
      • Vars
        • R(e);OGATE,XP(H)::QAB1(C),XR(e)
        • P(g);OGATEB,XB(G)::QAR(C)
        • R(e);OGATEB::QAR2(C),XR(e)
        • R(e);N_GUARD::QAB1(C),XP(c)
      • Refutation
        • S(a);
    • Try
      • Q(C);
      • Threat
        • QAR1(C),XP(g)
      • Refutation
        • R(e);XP(H)
  • Actual
    • R(B);XP(c)
    • Vars
      • K(d);OGATEB,S_FLIGHT,XR(B)::QAB1(C),XP(b)
      • R(e);OGATE,SBLOCK,XR(B)::QAR1(C),XP(g)
      • R(e);XP(H)::B(I)
      • S(a);N_GUARD,XQ(C)::R1(B)
      • P(g);N_GUARD,XB(G)::QAR1(C),XR(e)
      • R(e);::B(I)
      • S(a);N_GUARD::R1(B)
      • S(a);N_GUARD::R1(B),XS(a)
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