MESON Chess Problem Database

Problem Display
PID: 72094 (2B2n2/3q1Rp1/1N4p1/1p2kNP1/1P2n3/1pP2b2/3Q2p1/4R1K1 w - - 0 1)

Aloni, Yoel

4th Comm., StrateGems, 2007

2B2n2/3q1Rp1/1N4p1/1p2kNP1/1P2n3/1pP2b2/3Q2p1/4R1K1

#2

10 + 10

145 StrateGems 2009
15148 Sadier Collection 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Ke6
      • 2.Qd5#
    • 1...Qxc8
      • 2.Qd6#
    • 1...Qe8
      • 2.Qd6#
    • 1...Qd4+
      • 2.cxd4#
    • 1...Qd6
      • 2.Qxd6#
    • 1...Qa7
      • 2.Qd6#
    • 1...Qb7
      • 2.Qd6#
    • 1...Qxf7
      • 2.Qd6#
    • 1...Se6
      • 2.Sxd7#
  • Tries
    • 1.Sd6?
      • threat
        • 2.Qd5#
      • 1...Ke6
        • 2.Qd5#
      • 1...Qxd6
        • 2.Qf4#
      • 1...Qxf7
        • 2.Sxf7#
      • 1...Qc6
        • 2.Qf4#
        • 2.Qd4#
      • 1...Qe6
        • 2.Qf4#
        • 2.Qd4#
      • 1...Qb7
        • 2.Qf4#
        • 2.Qd4#
      • 1...Qf5!
    • 1.Sxd7+?
      • 1...Sxd7
        • 2.Qd6#
      • 1...Ke6!
    • 1.Bxd7?
      • threat
        • 2.Qd6#
      • 1...gxf5
        • 2.Rxf5#
      • 1...Be2!
    • 1.Rxe4+?
      • 1...Kxe4
        • 2.Qe3#
      • 1...Bxe4!
    • 1.Rxd7?
      • threat
        • 2.Rd5#
      • 1...Kxf5
        • 2.Rd5#
      • 1...Ke6
        • 2.Re7#
        • 2.Qd5#
      • 1...Sxd7!
    • 1.Qf4+?
      • 1...Ke6
        • 2.Sd4#
        • 2.Sxg7#
        • 2.Re7#
      • 1...Kxf4!
  • Keys
    • 1.Sd4!
      • threat
        • 2.Qf4#
      • 1...Qxd4+
        • 2.Qxd4#
      • 1...Kd6
        • 2.Qf4#
      • 1...Qxf7
        • 2.Sc6#
      • 1...Qg4
        • 2.Sc6#
      • 1...Qf5
        • 2.Sc6#
      • 1...Se6
        • 2.Sxf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • K(f);P-FLIGHT,P_SPINQ(h)::QAB1(C)
    • Q(h);N_GUARD,XB(J)::QAB1(C)
    • Q(h);N_GUARD::QAB1(C)
    • Q(h);CHECK,OGATE::P(D),XQ(h)
    • Q(h);N_GUARD::QAB1(C),XQ(h)
    • Q(h);N_GUARD,P_PINS(H)::QAB1(C)
    • Q(h);N_GUARD,XR(I)::QAB1(C)
    • S(j);N_GUARD,SBLOCK::S(H),XQ(h)
  • Tries
    • Try
      • S(F);
      • Threat
        • QAR1(C)
      • Vars
        • K(f);P-FLIGHT,P_SPINQ(h)::QAB1(C)
        • Q(h);SBLOCK,XS(F)::QAB1(C)
        • Q(h);XR(I)::S(F),XQ(h)
      • Refutation
        • Q(h);
    • Try
      • S(H);CHECK,XQ(h)
      • Vars
        • S(j);XS(H)::QAB1(C)
      • Refutation
        • K(f);P-FLIGHT
    • Try
      • B(J);XQ(h)
      • Threat
        • QAB1(C)
      • Vars
        • P(g);OGATE,XS(F)::R1(I),XP(g)
      • Refutation
        • B(c);N_SPINS(d)
    • Try
      • R(A);CHECK,XS(d)
      • Vars
        • K(f);P-FLIGHT,XR(A)::QAR1(C)
      • Refutation
        • B(c);XR(A)
    • Try
      • R(I);XQ(h)
      • Threat
        • R1(I)
      • Vars
        • K(f);N_SPINS(d),P-FLIGHT,XS(F)::B(J)+R(I),DCHECK
      • Refutation
        • S(j);XR(I)
    • Try
      • Q(C);CHECK
      • Refutation
        • K(f);N_SPINS(d),S_FLIGHT,XQ(C)
  • Actual
    • S(F);
    • Threat
      • QAB1(C)
    • Vars
      • Q(h);CHECK,OGATE,XS(F)::QAB1(C),XQ(h)
      • K(f);N_SPINS(d),S_FLIGHT::QAB(C)
      • Q(h);N_GUARD,XR(I)::S(F)
      • Q(h);N_GUARD::S(F)
      • S(j);SBLOCK::S(F),XB(c)
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