MESON Chess Problem Database

Problem Display
PID: 114210 (1B2Q1N1/p3P3/3pkp2/1n6/B1PpK3/n1pp4/4R3/8 w - - 0 1)

Stocchi, Ottavio

Chess, 1954

1B2Q1N1/p3P3/3pkp2/1n6/B1PpK3/n1pp4/4R3/8

#2

8 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sc7
      • 2.Bd7#
    • 1...d2
      • 2.Kf4#
    • 1...d5+
      • 2.cxd5#
    • 1...f5+
      • 2.Kxd3#
  • Tries
    • 1.Kf3+?
      • 1...Kf5
        • 2.Qh5#
      • 1...dxe2!
    • 1.Bxb5?
      • threat
        • 2.Bd7#
      • 1...d5+
        • 2.cxd5#
      • 1...f5+
        • 2.Kxd3#
      • 1...Sxb5!
    • 1.Rf2?
      • threat
        • 2.Rxf6#
      • 1...d5+
        • 2.cxd5#
      • 1...f5+!
    • 1.Qxb5?
      • threat
        • 2.Qd5#
        • 2.e8Q#
      • 1...d5+
        • 2.Qxd5#
      • 1...f5+
        • 2.Qxf5#
      • 1...Sxb5
        • 2.e8Q#
      • 1...Kf7!
    • 1.Qg6?
      • threat
        • 2.e8Q#
      • 1...Kd7
        • 2.e8Q#
      • 1...Sc7
        • 2.Kxd3#
        • 2.Qxf6#
      • 1...d5+!
    • 1.Qd7+?
      • 1...Kf7
        • 2.e8Q#
      • 1...Kxd7!
    • 1.Qf7+?
      • 1...Kd7
        • 2.e8Q#
      • 1...Kxf7!
    • 1.Qf8?
      • threat
        • 2.e8Q#
      • 1...f5+
        • 2.Qxf5#
      • 1...Kd7
        • 2.e8Q#
      • 1...Sc7
        • 2.Qxf6#
      • 1...d5+!
  • Keys
    • 1.Qh5!
      • threat
        • 2.e8Q#
      • 1...d5+
        • 2.Qxd5#
      • 1...f5+
        • 2.Qxf5#
      • 1...Kd7
        • 2.e8Q#
      • 1...Sc7
        • 2.Kxd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • S(e);OGATE::B(B)
    • P(c);N_GUARD::R(A)+K(D)
    • P(f);CHECK,OGATE::P(C),XP(f)
    • P(h);CHECK,SBLOCK::R(A)+K(D),XP(c)
  • Tries
    • Try
      • K(D);CHECK,S_FLIGHT
      • Vars
        • K(g);S_FLIGHT::QAR2(G)
      • Refutation
        • P(c);XR(A)
    • Try
      • B(B);XS(e)
      • Threat
        • B(B)
      • Vars
        • P(f);CHECK,OGATE::P(C),XP(f)
        • P(h);CHECK,SBLOCK::R(A)+K(D),XP(c)
      • Refutation
        • S(a);XB(B)
    • Try
      • R(A);
      • Threat
        • R1(A),XP(h)
      • Vars
        • P(f);CHECK,OGATE::P(C),XP(f)
      • Refutation
        • P(h);CHECK
    • Try
      • Q(G);XS(e)
      • Threat
        • DUALS(2)
      • Vars
        • P(f);CHECK::QAB1(G),XP(f)
        • P(h);CHECK::QAB1(G),XP(h)
        • S(a);XQ(G)::P=Q
      • Refutation
        • K(g);S_FLIGHT
    • Try
      • Q(G);P_PINP(h)
      • Threat
        • P=Q
      • Vars
        • K(g);N_SPINP(h),P_SPINS(e),S_FLIGHT::P=Q
      • Refutation
        • P(f);CHECK
    • Try
      • Q(G);CHECK
      • Vars
        • K(g);S_FLIGHT::P=Q
      • Refutation
        • K(g);P_SPINS(e),S_FLIGHT,XQ(G)
    • Try
      • Q(G);CHECK
      • Vars
        • K(g);P_SPINS(e),S_FLIGHT::P=Q
      • Refutation
        • K(g);S_FLIGHT,XQ(G)
    • Try
      • Q(G);
      • Threat
        • P=Q
      • Vars
        • P(h);CHECK,OGATE::QAB1(G),XP(h)
        • K(g);P_SPINS(e),S_FLIGHT::P=Q
        • S(e);::QAR1(G),XP(h)
      • Refutation
        • P(f);CHECK
  • Actual
    • Q(G);
    • Threat
      • P=Q
    • Vars
      • P(f);CHECK::QAB1(G),XP(f)
      • P(h);CHECK::QAB1(G),XP(h)
      • K(g);P_SPINS(e),S_FLIGHT::P=Q
      • S(e);::R(A)+K(D),XP(c)
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